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Finding the Fourth Proportional to 43,385.70, 65,005.65 and 21,151.20

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Solution

The fourth proportional to 43,385.70, 65,005.65 and 21,151.20 is: 31,691.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    43,385.70 : 65,005.65 = 21,151.20 : x
  2. Step 2: Convert to fraction form
    43,385.70/65,005.65 = 21,151.20/x
  3. Step 3: Cross multiply
    43,385.70x = 65,005.65 × 21,151.20
  4. Step 4: Simplify right side
    43,385.70x = 1,374,947,504.28
  5. Step 5: Solve for x
    x = 1,374,947,504.28/43,385.70
  6. Step 6: Final answer
    x = 31,691.26

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.