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Finding the Fourth Proportional to 91,963.13, 137,139.91 and 91,122.32

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Solution

The fourth proportional to 91,963.13, 137,139.91 and 91,122.32 is: 135,886.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,963.13 : 137,139.91 = 91,122.32 : x
  2. Step 2: Convert to fraction form
    91,963.13/137,139.91 = 91,122.32/x
  3. Step 3: Cross multiply
    91,963.13x = 137,139.91 × 91,122.32
  4. Step 4: Simplify right side
    91,963.13x = 12,496,506,878.84
  5. Step 5: Solve for x
    x = 12,496,506,878.84/91,963.13
  6. Step 6: Final answer
    x = 135,886.06

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.