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Finding the Fourth Proportional to 145,319.70, 217,906.65 and 66,344.70

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Solution

The fourth proportional to 145,319.70, 217,906.65 and 66,344.70 is: 99,483.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    145,319.70 : 217,906.65 = 66,344.70 : x
  2. Step 2: Convert to fraction form
    145,319.70/217,906.65 = 66,344.70/x
  3. Step 3: Cross multiply
    145,319.70x = 217,906.65 × 66,344.70
  4. Step 4: Simplify right side
    145,319.70x = 14,456,951,322.26
  5. Step 5: Solve for x
    x = 14,456,951,322.26/145,319.70
  6. Step 6: Final answer
    x = 99,483.77

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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.