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Finding the Fourth Proportional to 91,133.80, 136,719.90 and 38,516.20

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Solution

The fourth proportional to 91,133.80, 136,719.90 and 38,516.20 is: 57,782.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,133.80 : 136,719.90 = 38,516.20 : x
  2. Step 2: Convert to fraction form
    91,133.80/136,719.90 = 38,516.20/x
  3. Step 3: Cross multiply
    91,133.80x = 136,719.90 × 38,516.20
  4. Step 4: Simplify right side
    91,133.80x = 5,265,931,012.38
  5. Step 5: Solve for x
    x = 5,265,931,012.38/91,133.80
  6. Step 6: Final answer
    x = 57,782.41

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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.