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Finding the Fourth Proportional to 7,220.20, 10,830.30 and 7,143.40

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Solution

The fourth proportional to 7,220.20, 10,830.30 and 7,143.40 is: 10,715.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,220.20 : 10,830.30 = 7,143.40 : x
  2. Step 2: Convert to fraction form
    7,220.20/10,830.30 = 7,143.40/x
  3. Step 3: Cross multiply
    7,220.20x = 10,830.30 × 7,143.40
  4. Step 4: Simplify right side
    7,220.20x = 77,365,165.02
  5. Step 5: Solve for x
    x = 77,365,165.02/7,220.20
  6. Step 6: Final answer
    x = 10,715.10

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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.