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Finding the Fourth Proportional to 158,685.08, 218,989.98 and 90,713.12

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Solution

The fourth proportional to 158,685.08, 218,989.98 and 90,713.12 is: 125,186.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    158,685.08 : 218,989.98 = 90,713.12 : x
  2. Step 2: Convert to fraction form
    158,685.08/218,989.98 = 90,713.12/x
  3. Step 3: Cross multiply
    158,685.08x = 218,989.98 × 90,713.12
  4. Step 4: Simplify right side
    158,685.08x = 19,865,263,239.59
  5. Step 5: Solve for x
    x = 19,865,263,239.59/158,685.08
  6. Step 6: Final answer
    x = 125,186.71

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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.