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Finding the Fourth Proportional to 145,028.76, 217,260.45 and 81,655.17

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Solution

The fourth proportional to 145,028.76, 217,260.45 and 81,655.17 is: 122,323.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    145,028.76 : 217,260.45 = 81,655.17 : x
  2. Step 2: Convert to fraction form
    145,028.76/217,260.45 = 81,655.17/x
  3. Step 3: Cross multiply
    145,028.76x = 217,260.45 × 81,655.17
  4. Step 4: Simplify right side
    145,028.76x = 17,740,438,979.03
  5. Step 5: Solve for x
    x = 17,740,438,979.03/145,028.76
  6. Step 6: Final answer
    x = 122,323.59

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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.