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Finding the Fourth Proportional to 98,810.90, 136,266.92 and 91,471.69

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Solution

The fourth proportional to 98,810.90, 136,266.92 and 91,471.69 is: 126,145.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    98,810.90 : 136,266.92 = 91,471.69 : x
  2. Step 2: Convert to fraction form
    98,810.90/136,266.92 = 91,471.69/x
  3. Step 3: Cross multiply
    98,810.90x = 136,266.92 × 91,471.69
  4. Step 4: Simplify right side
    98,810.90x = 12,464,564,782.16
  5. Step 5: Solve for x
    x = 12,464,564,782.16/98,810.90
  6. Step 6: Final answer
    x = 126,145.65

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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.