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Finding the Fourth Proportional to 665,685.62, 918,539.97 and 379,211.30

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Solution

The fourth proportional to 665,685.62, 918,539.97 and 379,211.30 is: 523,251.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    665,685.62 : 918,539.97 = 379,211.30 : x
  2. Step 2: Convert to fraction form
    665,685.62/918,539.97 = 379,211.30/x
  3. Step 3: Cross multiply
    665,685.62x = 918,539.97 × 379,211.30
  4. Step 4: Simplify right side
    665,685.62x = 348,320,736,125.66
  5. Step 5: Solve for x
    x = 348,320,736,125.66/665,685.62
  6. Step 6: Final answer
    x = 523,251.10

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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.