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Finding the Fourth Proportional to 109,670.78, 151,344.51 and 61,921.28

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Solution

The fourth proportional to 109,670.78, 151,344.51 and 61,921.28 is: 85,450.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    109,670.78 : 151,344.51 = 61,921.28 : x
  2. Step 2: Convert to fraction form
    109,670.78/151,344.51 = 61,921.28/x
  3. Step 3: Cross multiply
    109,670.78x = 151,344.51 × 61,921.28
  4. Step 4: Simplify right side
    109,670.78x = 9,371,445,780.17
  5. Step 5: Solve for x
    x = 9,371,445,780.17/109,670.78
  6. Step 6: Final answer
    x = 85,450.71

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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.