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Finding the Fourth Proportional to 158,609.78, 218,861.32 and 90,631.15

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Solution

The fourth proportional to 158,609.78, 218,861.32 and 90,631.15 is: 125,059.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    158,609.78 : 218,861.32 = 90,631.15 : x
  2. Step 2: Convert to fraction form
    158,609.78/218,861.32 = 90,631.15/x
  3. Step 3: Cross multiply
    158,609.78x = 218,861.32 × 90,631.15
  4. Step 4: Simplify right side
    158,609.78x = 19,835,653,122.12
  5. Step 5: Solve for x
    x = 19,835,653,122.12/158,609.78
  6. Step 6: Final answer
    x = 125,059.46

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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.