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Finding the Fourth Proportional to 7,039.40, 10,559.10 and 6,391.40

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Solution

The fourth proportional to 7,039.40, 10,559.10 and 6,391.40 is: 9,587.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,039.40 : 10,559.10 = 6,391.40 : x
  2. Step 2: Convert to fraction form
    7,039.40/10,559.10 = 6,391.40/x
  3. Step 3: Cross multiply
    7,039.40x = 10,559.10 × 6,391.40
  4. Step 4: Simplify right side
    7,039.40x = 67,487,431.74
  5. Step 5: Solve for x
    x = 67,487,431.74/7,039.40
  6. Step 6: Final answer
    x = 9,587.10

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Half scale
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Double scale
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Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.