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Finding the Fourth Proportional to 38,439.50, 53,047.32 and 21,672.50

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Solution

The fourth proportional to 38,439.50, 53,047.32 and 21,672.50 is: 29,908.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    38,439.50 : 53,047.32 = 21,672.50 : x
  2. Step 2: Convert to fraction form
    38,439.50/53,047.32 = 21,672.50/x
  3. Step 3: Cross multiply
    38,439.50x = 53,047.32 × 21,672.50
  4. Step 4: Simplify right side
    38,439.50x = 1,149,668,042.70
  5. Step 5: Solve for x
    x = 1,149,668,042.70/38,439.50
  6. Step 6: Final answer
    x = 29,908.51

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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.