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Finding the Fourth Proportional to 42,480.80, 63,721.20 and 12,897.20

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Solution

The fourth proportional to 42,480.80, 63,721.20 and 12,897.20 is: 19,345.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    42,480.80 : 63,721.20 = 12,897.20 : x
  2. Step 2: Convert to fraction form
    42,480.80/63,721.20 = 12,897.20/x
  3. Step 3: Cross multiply
    42,480.80x = 63,721.20 × 12,897.20
  4. Step 4: Simplify right side
    42,480.80x = 821,825,060.64
  5. Step 5: Solve for x
    x = 821,825,060.64/42,480.80
  6. Step 6: Final answer
    x = 19,345.80

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1.5x scale

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.