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Finding the Fourth Proportional to 158,667.81, 218,980.95 and 90,687.64

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Solution

The fourth proportional to 158,667.81, 218,980.95 and 90,687.64 is: 125,160.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    158,667.81 : 218,980.95 = 90,687.64 : x
  2. Step 2: Convert to fraction form
    158,667.81/218,980.95 = 90,687.64/x
  3. Step 3: Cross multiply
    158,667.81x = 218,980.95 × 90,687.64
  4. Step 4: Simplify right side
    158,667.81x = 19,858,865,560.46
  5. Step 5: Solve for x
    x = 19,858,865,560.46/158,667.81
  6. Step 6: Final answer
    x = 125,160.02

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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.