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Finding the Fourth Proportional to 715,518.78, 987,439.59 and 393,240.30

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Solution

The fourth proportional to 715,518.78, 987,439.59 and 393,240.30 is: 542,684.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    715,518.78 : 987,439.59 = 393,240.30 : x
  2. Step 2: Convert to fraction form
    715,518.78/987,439.59 = 393,240.30/x
  3. Step 3: Cross multiply
    715,518.78x = 987,439.59 × 393,240.30
  4. Step 4: Simplify right side
    715,518.78x = 388,301,040,603.48
  5. Step 5: Solve for x
    x = 388,301,040,603.48/715,518.78
  6. Step 6: Final answer
    x = 542,684.62

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Double scale
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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.