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Finding the Fourth Proportional to 661,146.40, 991,719.60 and 656,231.20

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Solution

The fourth proportional to 661,146.40, 991,719.60 and 656,231.20 is: 984,346.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    661,146.40 : 991,719.60 = 656,231.20 : x
  2. Step 2: Convert to fraction form
    661,146.40/991,719.60 = 656,231.20/x
  3. Step 3: Cross multiply
    661,146.40x = 991,719.60 × 656,231.20
  4. Step 4: Simplify right side
    661,146.40x = 650,797,343,171.52
  5. Step 5: Solve for x
    x = 650,797,343,171.52/661,146.40
  6. Step 6: Final answer
    x = 984,346.80

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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.