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Finding the Fourth Proportional to 715,892.79, 987,873.24 and 421,495.71

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Solution

The fourth proportional to 715,892.79, 987,873.24 and 421,495.71 is: 581,629.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    715,892.79 : 987,873.24 = 421,495.71 : x
  2. Step 2: Convert to fraction form
    715,892.79/987,873.24 = 421,495.71/x
  3. Step 3: Cross multiply
    715,892.79x = 987,873.24 × 421,495.71
  4. Step 4: Simplify right side
    715,892.79x = 416,384,332,683.80
  5. Step 5: Solve for x
    x = 416,384,332,683.80/715,892.79
  6. Step 6: Final answer
    x = 581,629.45

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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.