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Finding the Fourth Proportional to 7,170.99, 9,871.40 and 6,221.19

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Solution

The fourth proportional to 7,170.99, 9,871.40 and 6,221.19 is: 8,563.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,170.99 : 9,871.40 = 6,221.19 : x
  2. Step 2: Convert to fraction form
    7,170.99/9,871.40 = 6,221.19/x
  3. Step 3: Cross multiply
    7,170.99x = 9,871.40 × 6,221.19
  4. Step 4: Simplify right side
    7,170.99x = 61,411,817.02
  5. Step 5: Solve for x
    x = 61,411,817.02/7,170.99
  6. Step 6: Final answer
    x = 8,563.93

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Half scale
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Double scale
Find fourth proportional to 7,171.99, 9,872.77 and 6,222.19
Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.