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Finding the Fourth Proportional to 715,317.30, 987,154.20 and 393,006.96

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Solution

The fourth proportional to 715,317.30, 987,154.20 and 393,006.96 is: 542,358.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    715,317.30 : 987,154.20 = 393,006.96 : x
  2. Step 2: Convert to fraction form
    715,317.30/987,154.20 = 393,006.96/x
  3. Step 3: Cross multiply
    715,317.30x = 987,154.20 × 393,006.96
  4. Step 4: Simplify right side
    715,317.30x = 387,958,471,193.23
  5. Step 5: Solve for x
    x = 387,958,471,193.23/715,317.30
  6. Step 6: Final answer
    x = 542,358.57

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1.5x scale

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.