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Finding the Fourth Proportional to 67,287.40, 100,931.10 and 40,978.60

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Solution

The fourth proportional to 67,287.40, 100,931.10 and 40,978.60 is: 61,467.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    67,287.40 : 100,931.10 = 40,978.60 : x
  2. Step 2: Convert to fraction form
    67,287.40/100,931.10 = 40,978.60/x
  3. Step 3: Cross multiply
    67,287.40x = 100,931.10 × 40,978.60
  4. Step 4: Simplify right side
    67,287.40x = 4,136,015,174.46
  5. Step 5: Solve for x
    x = 4,136,015,174.46/67,287.40
  6. Step 6: Final answer
    x = 61,467.90

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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.