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Finding the Fourth Proportional to 85,287.40, 127,931.10 and 77,122.60

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Solution

The fourth proportional to 85,287.40, 127,931.10 and 77,122.60 is: 115,683.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,287.40 : 127,931.10 = 77,122.60 : x
  2. Step 2: Convert to fraction form
    85,287.40/127,931.10 = 77,122.60/x
  3. Step 3: Cross multiply
    85,287.40x = 127,931.10 × 77,122.60
  4. Step 4: Simplify right side
    85,287.40x = 9,866,379,052.86
  5. Step 5: Solve for x
    x = 9,866,379,052.86/85,287.40
  6. Step 6: Final answer
    x = 115,683.90

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1.5x scale

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.