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Finding the Fourth Proportional to 101,422.80, 139,916.90 and 65,624.48

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Solution

The fourth proportional to 101,422.80, 139,916.90 and 65,624.48 is: 90,531.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    101,422.80 : 139,916.90 = 65,624.48 : x
  2. Step 2: Convert to fraction form
    101,422.80/139,916.90 = 65,624.48/x
  3. Step 3: Cross multiply
    101,422.80x = 139,916.90 × 65,624.48
  4. Step 4: Simplify right side
    101,422.80x = 9,181,973,805.71
  5. Step 5: Solve for x
    x = 9,181,973,805.71/101,422.80
  6. Step 6: Final answer
    x = 90,531.65

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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.