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Finding the Fourth Proportional to 85,891.88, 128,592.06 and 58,140.20

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Solution

The fourth proportional to 85,891.88, 128,592.06 and 58,140.20 is: 87,043.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,891.88 : 128,592.06 = 58,140.20 : x
  2. Step 2: Convert to fraction form
    85,891.88/128,592.06 = 58,140.20/x
  3. Step 3: Cross multiply
    85,891.88x = 128,592.06 × 58,140.20
  4. Step 4: Simplify right side
    85,891.88x = 7,476,368,086.81
  5. Step 5: Solve for x
    x = 7,476,368,086.81/85,891.88
  6. Step 6: Final answer
    x = 87,043.95

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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.