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Finding the Fourth Proportional to 30,608.88, 42,257.88 and 20,551.92

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Solution

The fourth proportional to 30,608.88, 42,257.88 and 20,551.92 is: 28,373.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,608.88 : 42,257.88 = 20,551.92 : x
  2. Step 2: Convert to fraction form
    30,608.88/42,257.88 = 20,551.92/x
  3. Step 3: Cross multiply
    30,608.88x = 42,257.88 × 20,551.92
  4. Step 4: Simplify right side
    30,608.88x = 868,480,569.13
  5. Step 5: Solve for x
    x = 868,480,569.13/30,608.88
  6. Step 6: Final answer
    x = 28,373.48

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1.5x scale

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.