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Finding the Fourth Proportional to 98,780, 136,267.76 and 66,958.88

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Solution

The fourth proportional to 98,780, 136,267.76 and 66,958.88 is: 92,370.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    98,780 : 136,267.76 = 66,958.88 : x
  2. Step 2: Convert to fraction form
    98,780/136,267.76 = 66,958.88/x
  3. Step 3: Cross multiply
    98,780x = 136,267.76 × 66,958.88
  4. Step 4: Simplify right side
    98,780x = 9,124,336,589.71
  5. Step 5: Solve for x
    x = 9,124,336,589.71/98,780
  6. Step 6: Final answer
    x = 92,370.28

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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.