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Finding the Fourth Proportional to 665,548.86, 918,645.56 and 393,711.30

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Solution

The fourth proportional to 665,548.86, 918,645.56 and 393,711.30 is: 543,432.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    665,548.86 : 918,645.56 = 393,711.30 : x
  2. Step 2: Convert to fraction form
    665,548.86/918,645.56 = 393,711.30/x
  3. Step 3: Cross multiply
    665,548.86x = 918,645.56 × 393,711.30
  4. Step 4: Simplify right side
    665,548.86x = 361,681,137,666.83
  5. Step 5: Solve for x
    x = 361,681,137,666.83/665,548.86
  6. Step 6: Final answer
    x = 543,432.89

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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.