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Finding the Fourth Proportional to 715,740.71, 987,709.34 and 393,443.88

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Solution

The fourth proportional to 715,740.71, 987,709.34 and 393,443.88 is: 542,945.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    715,740.71 : 987,709.34 = 393,443.88 : x
  2. Step 2: Convert to fraction form
    715,740.71/987,709.34 = 393,443.88/x
  3. Step 3: Cross multiply
    715,740.71x = 987,709.34 × 393,443.88
  4. Step 4: Simplify right side
    715,740.71x = 388,608,197,877.40
  5. Step 5: Solve for x
    x = 388,608,197,877.40/715,740.71
  6. Step 6: Final answer
    x = 542,945.50

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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.