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Finding the Fourth Proportional to 38,687.76, 53,389.08 and 21,920.76

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Solution

The fourth proportional to 38,687.76, 53,389.08 and 21,920.76 is: 30,250.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    38,687.76 : 53,389.08 = 21,920.76 : x
  2. Step 2: Convert to fraction form
    38,687.76/53,389.08 = 21,920.76/x
  3. Step 3: Cross multiply
    38,687.76x = 53,389.08 × 21,920.76
  4. Step 4: Simplify right side
    38,687.76x = 1,170,329,209.30
  5. Step 5: Solve for x
    x = 1,170,329,209.30/38,687.76
  6. Step 6: Final answer
    x = 30,250.63

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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.