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Finding the Fourth Proportional to 85,591.80, 128,385.30 and 38,844.60

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Solution

The fourth proportional to 85,591.80, 128,385.30 and 38,844.60 is: 58,265.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,591.80 : 128,385.30 = 38,844.60 : x
  2. Step 2: Convert to fraction form
    85,591.80/128,385.30 = 38,844.60/x
  3. Step 3: Cross multiply
    85,591.80x = 128,385.30 × 38,844.60
  4. Step 4: Simplify right side
    85,591.80x = 4,987,075,624.38
  5. Step 5: Solve for x
    x = 4,987,075,624.38/85,591.80
  6. Step 6: Final answer
    x = 58,265.81

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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.