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Finding the Fourth Proportional to 15,354.80, 21,188.10 and 8,640.28

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Solution

The fourth proportional to 15,354.80, 21,188.10 and 8,640.28 is: 11,922.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,354.80 : 21,188.10 = 8,640.28 : x
  2. Step 2: Convert to fraction form
    15,354.80/21,188.10 = 8,640.28/x
  3. Step 3: Cross multiply
    15,354.80x = 21,188.10 × 8,640.28
  4. Step 4: Simplify right side
    15,354.80x = 183,071,116.67
  5. Step 5: Solve for x
    x = 183,071,116.67/15,354.80
  6. Step 6: Final answer
    x = 11,922.73

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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.