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Finding the Fourth Proportional to 7,129.20, 10,693.80 and 5,660.40

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Solution

The fourth proportional to 7,129.20, 10,693.80 and 5,660.40 is: 8,490.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,129.20 : 10,693.80 = 5,660.40 : x
  2. Step 2: Convert to fraction form
    7,129.20/10,693.80 = 5,660.40/x
  3. Step 3: Cross multiply
    7,129.20x = 10,693.80 × 5,660.40
  4. Step 4: Simplify right side
    7,129.20x = 60,531,185.52
  5. Step 5: Solve for x
    x = 60,531,185.52/7,129.20
  6. Step 6: Final answer
    x = 8,490.60

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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.