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Finding the Fourth Proportional to 123,911.51, 171,001.60 and 87,677.91

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Solution

The fourth proportional to 123,911.51, 171,001.60 and 87,677.91 is: 120,998.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    123,911.51 : 171,001.60 = 87,677.91 : x
  2. Step 2: Convert to fraction form
    123,911.51/171,001.60 = 87,677.91/x
  3. Step 3: Cross multiply
    123,911.51x = 171,001.60 × 87,677.91
  4. Step 4: Simplify right side
    123,911.51x = 14,993,062,675.46
  5. Step 5: Solve for x
    x = 14,993,062,675.46/123,911.51
  6. Step 6: Final answer
    x = 120,998.15

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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.