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Finding the Fourth Proportional to 155,835.18, 215,086 and 98,438

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Solution

The fourth proportional to 155,835.18, 215,086 and 98,438 is: 135,865.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    155,835.18 : 215,086 = 98,438 : x
  2. Step 2: Convert to fraction form
    155,835.18/215,086 = 98,438/x
  3. Step 3: Cross multiply
    155,835.18x = 215,086 × 98,438
  4. Step 4: Simplify right side
    155,835.18x = 21,172,635,668
  5. Step 5: Solve for x
    x = 21,172,635,668/155,835.18
  6. Step 6: Final answer
    x = 135,865.57

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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.