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Finding the Fourth Proportional to 15,354.78, 21,191.48 and 8,640.70

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Solution

The fourth proportional to 15,354.78, 21,191.48 and 8,640.70 is: 11,925.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,354.78 : 21,191.48 = 8,640.70 : x
  2. Step 2: Convert to fraction form
    15,354.78/21,191.48 = 8,640.70/x
  3. Step 3: Cross multiply
    15,354.78x = 21,191.48 × 8,640.70
  4. Step 4: Simplify right side
    15,354.78x = 183,109,221.24
  5. Step 5: Solve for x
    x = 183,109,221.24/15,354.78
  6. Step 6: Final answer
    x = 11,925.23

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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.