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Finding the Fourth Proportional to 115,103.40, 158,920.98 and 72,100.64

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Solution

The fourth proportional to 115,103.40, 158,920.98 and 72,100.64 is: 99,547.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    115,103.40 : 158,920.98 = 72,100.64 : x
  2. Step 2: Convert to fraction form
    115,103.40/158,920.98 = 72,100.64/x
  3. Step 3: Cross multiply
    115,103.40x = 158,920.98 × 72,100.64
  4. Step 4: Simplify right side
    115,103.40x = 11,458,304,367.43
  5. Step 5: Solve for x
    x = 11,458,304,367.43/115,103.40
  6. Step 6: Final answer
    x = 99,547.92

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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.