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Finding the Fourth Proportional to 78,432.88, 117,672.41 and 28,512.19

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Solution

The fourth proportional to 78,432.88, 117,672.41 and 28,512.19 is: 42,776.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,432.88 : 117,672.41 = 28,512.19 : x
  2. Step 2: Convert to fraction form
    78,432.88/117,672.41 = 28,512.19/x
  3. Step 3: Cross multiply
    78,432.88x = 117,672.41 × 28,512.19
  4. Step 4: Simplify right side
    78,432.88x = 3,355,098,111.68
  5. Step 5: Solve for x
    x = 3,355,098,111.68/78,432.88
  6. Step 6: Final answer
    x = 42,776.68

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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.