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Finding the Fourth Proportional to 65,715.20, 98,572.80 and 18,330.20

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Solution

The fourth proportional to 65,715.20, 98,572.80 and 18,330.20 is: 27,495.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    65,715.20 : 98,572.80 = 18,330.20 : x
  2. Step 2: Convert to fraction form
    65,715.20/98,572.80 = 18,330.20/x
  3. Step 3: Cross multiply
    65,715.20x = 98,572.80 × 18,330.20
  4. Step 4: Simplify right side
    65,715.20x = 1,806,859,138.56
  5. Step 5: Solve for x
    x = 1,806,859,138.56/65,715.20
  6. Step 6: Final answer
    x = 27,495.30

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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.