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Finding the Fourth Proportional to 15,689.80, 21,652.44 and 8,974.90

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Solution

The fourth proportional to 15,689.80, 21,652.44 and 8,974.90 is: 12,385.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,689.80 : 21,652.44 = 8,974.90 : x
  2. Step 2: Convert to fraction form
    15,689.80/21,652.44 = 8,974.90/x
  3. Step 3: Cross multiply
    15,689.80x = 21,652.44 × 8,974.90
  4. Step 4: Simplify right side
    15,689.80x = 194,328,483.76
  5. Step 5: Solve for x
    x = 194,328,483.76/15,689.80
  6. Step 6: Final answer
    x = 12,385.66

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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.