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Finding the Fourth Proportional to 715,479.45, 987,313.91 and 393,182.61

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Solution

The fourth proportional to 715,479.45, 987,313.91 and 393,182.61 is: 542,565.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    715,479.45 : 987,313.91 = 393,182.61 : x
  2. Step 2: Convert to fraction form
    715,479.45/987,313.91 = 393,182.61/x
  3. Step 3: Cross multiply
    715,479.45x = 987,313.91 × 393,182.61
  4. Step 4: Simplify right side
    715,479.45x = 388,194,658,057.19
  5. Step 5: Solve for x
    x = 388,194,658,057.19/715,479.45
  6. Step 6: Final answer
    x = 542,565.77

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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.