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Finding the Fourth Proportional to 42,480.76, 63,721.14 and 12,898.75

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Solution

The fourth proportional to 42,480.76, 63,721.14 and 12,898.75 is: 19,348.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    42,480.76 : 63,721.14 = 12,898.75 : x
  2. Step 2: Convert to fraction form
    42,480.76/63,721.14 = 12,898.75/x
  3. Step 3: Cross multiply
    42,480.76x = 63,721.14 × 12,898.75
  4. Step 4: Simplify right side
    42,480.76x = 821,923,054.58
  5. Step 5: Solve for x
    x = 821,923,054.58/42,480.76
  6. Step 6: Final answer
    x = 19,348.13

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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.