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Finding the Fourth Proportional to 158,543.08, 218,784.70 and 86,920.65

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Solution

The fourth proportional to 158,543.08, 218,784.70 and 86,920.65 is: 119,947.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    158,543.08 : 218,784.70 = 86,920.65 : x
  2. Step 2: Convert to fraction form
    158,543.08/218,784.70 = 86,920.65/x
  3. Step 3: Cross multiply
    158,543.08x = 218,784.70 × 86,920.65
  4. Step 4: Simplify right side
    158,543.08x = 19,016,908,334.06
  5. Step 5: Solve for x
    x = 19,016,908,334.06/158,543.08
  6. Step 6: Final answer
    x = 119,947.89

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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.