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Finding the Fourth Proportional to 102,642.80, 153,964.20 and 87,609.20

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Solution

The fourth proportional to 102,642.80, 153,964.20 and 87,609.20 is: 131,413.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    102,642.80 : 153,964.20 = 87,609.20 : x
  2. Step 2: Convert to fraction form
    102,642.80/153,964.20 = 87,609.20/x
  3. Step 3: Cross multiply
    102,642.80x = 153,964.20 × 87,609.20
  4. Step 4: Simplify right side
    102,642.80x = 13,488,680,390.64
  5. Step 5: Solve for x
    x = 13,488,680,390.64/102,642.80
  6. Step 6: Final answer
    x = 131,413.80

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.