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Finding the Fourth Proportional to 715,475.70, 987,308.73 and 393,178.86

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Solution

The fourth proportional to 715,475.70, 987,308.73 and 393,178.86 is: 542,560.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    715,475.70 : 987,308.73 = 393,178.86 : x
  2. Step 2: Convert to fraction form
    715,475.70/987,308.73 = 393,178.86/x
  3. Step 3: Cross multiply
    715,475.70x = 987,308.73 × 393,178.86
  4. Step 4: Simplify right side
    715,475.70x = 388,188,920,929.45
  5. Step 5: Solve for x
    x = 388,188,920,929.45/715,475.70
  6. Step 6: Final answer
    x = 542,560.59

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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.