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Finding the Fourth Proportional to 109,661.62, 151,331.72 and 61,916.98

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Solution

The fourth proportional to 109,661.62, 151,331.72 and 61,916.98 is: 85,444.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    109,661.62 : 151,331.72 = 61,916.98 : x
  2. Step 2: Convert to fraction form
    109,661.62/151,331.72 = 61,916.98/x
  3. Step 3: Cross multiply
    109,661.62x = 151,331.72 × 61,916.98
  4. Step 4: Simplify right side
    109,661.62x = 9,370,003,080.61
  5. Step 5: Solve for x
    x = 9,370,003,080.61/109,661.62
  6. Step 6: Final answer
    x = 85,444.69

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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.