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Finding the Fourth Proportional to 158,667.56, 218,980.61 and 90,687.40

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Solution

The fourth proportional to 158,667.56, 218,980.61 and 90,687.40 is: 125,159.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    158,667.56 : 218,980.61 = 90,687.40 : x
  2. Step 2: Convert to fraction form
    158,667.56/218,980.61 = 90,687.40/x
  3. Step 3: Cross multiply
    158,667.56x = 218,980.61 × 90,687.40
  4. Step 4: Simplify right side
    158,667.56x = 19,858,781,850.58
  5. Step 5: Solve for x
    x = 19,858,781,850.58/158,667.56
  6. Step 6: Final answer
    x = 125,159.69

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1.5x scale

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.