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Finding the Fourth Proportional to 85,578.60, 128,022.30 and 74,020.20

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Solution

The fourth proportional to 85,578.60, 128,022.30 and 74,020.20 is: 110,731.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,578.60 : 128,022.30 = 74,020.20 : x
  2. Step 2: Convert to fraction form
    85,578.60/128,022.30 = 74,020.20/x
  3. Step 3: Cross multiply
    85,578.60x = 128,022.30 × 74,020.20
  4. Step 4: Simplify right side
    85,578.60x = 9,476,236,250.46
  5. Step 5: Solve for x
    x = 9,476,236,250.46/85,578.60
  6. Step 6: Final answer
    x = 110,731.38

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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.