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Finding the Fourth Proportional to 665,520.80, 918,581.91 and 379,209.74

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Solution

The fourth proportional to 665,520.80, 918,581.91 and 379,209.74 is: 523,402.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    665,520.80 : 918,581.91 = 379,209.74 : x
  2. Step 2: Convert to fraction form
    665,520.80/918,581.91 = 379,209.74/x
  3. Step 3: Cross multiply
    665,520.80x = 918,581.91 × 379,209.74
  4. Step 4: Simplify right side
    665,520.80x = 348,335,207,259.80
  5. Step 5: Solve for x
    x = 348,335,207,259.80/665,520.80
  6. Step 6: Final answer
    x = 523,402.43

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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.