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Finding the Fourth Proportional to 91,368.72, 136,720.80 and 75,425.49

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Solution

The fourth proportional to 91,368.72, 136,720.80 and 75,425.49 is: 112,863.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,368.72 : 136,720.80 = 75,425.49 : x
  2. Step 2: Convert to fraction form
    91,368.72/136,720.80 = 75,425.49/x
  3. Step 3: Cross multiply
    91,368.72x = 136,720.80 × 75,425.49
  4. Step 4: Simplify right side
    91,368.72x = 10,312,233,333.19
  5. Step 5: Solve for x
    x = 10,312,233,333.19/91,368.72
  6. Step 6: Final answer
    x = 112,863.94

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.