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Finding the Fourth Proportional to 715,369.47, 987,234.12 and 393,091.14

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Solution

The fourth proportional to 715,369.47, 987,234.12 and 393,091.14 is: 542,479.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    715,369.47 : 987,234.12 = 393,091.14 : x
  2. Step 2: Convert to fraction form
    715,369.47/987,234.12 = 393,091.14/x
  3. Step 3: Cross multiply
    715,369.47x = 987,234.12 × 393,091.14
  4. Step 4: Simplify right side
    715,369.47x = 388,072,985,677.70
  5. Step 5: Solve for x
    x = 388,072,985,677.70/715,369.47
  6. Step 6: Final answer
    x = 542,479.10

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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.