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Finding the Fourth Proportional to 158,490.10, 218,721.75 and 86,870.10

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Solution

The fourth proportional to 158,490.10, 218,721.75 and 86,870.10 is: 119,883.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    158,490.10 : 218,721.75 = 86,870.10 : x
  2. Step 2: Convert to fraction form
    158,490.10/218,721.75 = 86,870.10/x
  3. Step 3: Cross multiply
    158,490.10x = 218,721.75 × 86,870.10
  4. Step 4: Simplify right side
    158,490.10x = 19,000,380,294.68
  5. Step 5: Solve for x
    x = 19,000,380,294.68/158,490.10
  6. Step 6: Final answer
    x = 119,883.71

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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.