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Finding the Fourth Proportional to 28,379.61, 42,569.45 and 8,657.12

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Solution

The fourth proportional to 28,379.61, 42,569.45 and 8,657.12 is: 12,985.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,379.61 : 42,569.45 = 8,657.12 : x
  2. Step 2: Convert to fraction form
    28,379.61/42,569.45 = 8,657.12/x
  3. Step 3: Cross multiply
    28,379.61x = 42,569.45 × 8,657.12
  4. Step 4: Simplify right side
    28,379.61x = 368,528,836.98
  5. Step 5: Solve for x
    x = 368,528,836.98/28,379.61
  6. Step 6: Final answer
    x = 12,985.69

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Similar ratio
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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.