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Finding the Fourth Proportional to 15,158.10, 20,916.90 and 8,442.66

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Solution

The fourth proportional to 15,158.10, 20,916.90 and 8,442.66 is: 11,650.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,158.10 : 20,916.90 = 8,442.66 : x
  2. Step 2: Convert to fraction form
    15,158.10/20,916.90 = 8,442.66/x
  3. Step 3: Cross multiply
    15,158.10x = 20,916.90 × 8,442.66
  4. Step 4: Simplify right side
    15,158.10x = 176,594,274.95
  5. Step 5: Solve for x
    x = 176,594,274.95/15,158.10
  6. Step 6: Final answer
    x = 11,650.16

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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.