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Finding the Fourth Proportional to 28,671.20, 42,965.12 and 12,641.24

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Solution

The fourth proportional to 28,671.20, 42,965.12 and 12,641.24 is: 18,943.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,671.20 : 42,965.12 = 12,641.24 : x
  2. Step 2: Convert to fraction form
    28,671.20/42,965.12 = 12,641.24/x
  3. Step 3: Cross multiply
    28,671.20x = 42,965.12 × 12,641.24
  4. Step 4: Simplify right side
    28,671.20x = 543,132,393.55
  5. Step 5: Solve for x
    x = 543,132,393.55/28,671.20
  6. Step 6: Final answer
    x = 18,943.48

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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.