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Finding the Fourth Proportional to 486,432.76, 729,040 and 261,239.80

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Solution

The fourth proportional to 486,432.76, 729,040 and 261,239.80 is: 391,532.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    486,432.76 : 729,040 = 261,239.80 : x
  2. Step 2: Convert to fraction form
    486,432.76/729,040 = 261,239.80/x
  3. Step 3: Cross multiply
    486,432.76x = 729,040 × 261,239.80
  4. Step 4: Simplify right side
    486,432.76x = 190,454,263,792
  5. Step 5: Solve for x
    x = 190,454,263,792/486,432.76
  6. Step 6: Final answer
    x = 391,532.56

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.