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Finding the Fourth Proportional to 158,666.81, 218,979.57 and 90,686.64

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Solution

The fourth proportional to 158,666.81, 218,979.57 and 90,686.64 is: 125,158.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    158,666.81 : 218,979.57 = 90,686.64 : x
  2. Step 2: Convert to fraction form
    158,666.81/218,979.57 = 90,686.64/x
  3. Step 3: Cross multiply
    158,666.81x = 218,979.57 × 90,686.64
  4. Step 4: Simplify right side
    158,666.81x = 19,858,522,593.19
  5. Step 5: Solve for x
    x = 19,858,522,593.19/158,666.81
  6. Step 6: Final answer
    x = 125,158.65

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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.