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Finding the Fourth Proportional to 486,472.64, 670,736.50 and 400,129.88

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Solution

The fourth proportional to 486,472.64, 670,736.50 and 400,129.88 is: 551,689.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    486,472.64 : 670,736.50 = 400,129.88 : x
  2. Step 2: Convert to fraction form
    486,472.64/670,736.50 = 400,129.88/x
  3. Step 3: Cross multiply
    486,472.64x = 670,736.50 × 400,129.88
  4. Step 4: Simplify right side
    486,472.64x = 268,381,710,902.61
  5. Step 5: Solve for x
    x = 268,381,710,902.61/486,472.64
  6. Step 6: Final answer
    x = 551,689.22

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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.