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Finding the Fourth Proportional to 136,710.65, 188,638.07 and 91,315.82

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Solution

The fourth proportional to 136,710.65, 188,638.07 and 91,315.82 is: 126,000.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    136,710.65 : 188,638.07 = 91,315.82 : x
  2. Step 2: Convert to fraction form
    136,710.65/188,638.07 = 91,315.82/x
  3. Step 3: Cross multiply
    136,710.65x = 188,638.07 × 91,315.82
  4. Step 4: Simplify right side
    136,710.65x = 17,225,640,060.28
  5. Step 5: Solve for x
    x = 17,225,640,060.28/136,710.65
  6. Step 6: Final answer
    x = 126,000.72

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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.