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Finding the Fourth Proportional to 158,685.10, 218,985.42 and 90,703.53

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Solution

The fourth proportional to 158,685.10, 218,985.42 and 90,703.53 is: 125,170.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    158,685.10 : 218,985.42 = 90,703.53 : x
  2. Step 2: Convert to fraction form
    158,685.10/218,985.42 = 90,703.53/x
  3. Step 3: Cross multiply
    158,685.10x = 218,985.42 × 90,703.53
  4. Step 4: Simplify right side
    158,685.10x = 19,862,749,517.61
  5. Step 5: Solve for x
    x = 19,862,749,517.61/158,685.10
  6. Step 6: Final answer
    x = 125,170.85

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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.