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Finding the Fourth Proportional to 15,881.85, 21,916.65 and 8,808.12

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Solution

The fourth proportional to 15,881.85, 21,916.65 and 8,808.12 is: 12,155.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,881.85 : 21,916.65 = 8,808.12 : x
  2. Step 2: Convert to fraction form
    15,881.85/21,916.65 = 8,808.12/x
  3. Step 3: Cross multiply
    15,881.85x = 21,916.65 × 8,808.12
  4. Step 4: Simplify right side
    15,881.85x = 193,044,483.20
  5. Step 5: Solve for x
    x = 193,044,483.20/15,881.85
  6. Step 6: Final answer
    x = 12,155.04

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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.