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Finding the Fourth Proportional to 153,871.35, 212,377.88 and 90,229.65

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Solution

The fourth proportional to 153,871.35, 212,377.88 and 90,229.65 is: 124,537.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    153,871.35 : 212,377.88 = 90,229.65 : x
  2. Step 2: Convert to fraction form
    153,871.35/212,377.88 = 90,229.65/x
  3. Step 3: Cross multiply
    153,871.35x = 212,377.88 × 90,229.65
  4. Step 4: Simplify right side
    153,871.35x = 19,162,781,209.30
  5. Step 5: Solve for x
    x = 19,162,781,209.30/153,871.35
  6. Step 6: Final answer
    x = 124,537.68

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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.