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Finding the Fourth Proportional to 85,839.10, 128,758.65 and 84,381.10

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Solution

The fourth proportional to 85,839.10, 128,758.65 and 84,381.10 is: 126,571.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,839.10 : 128,758.65 = 84,381.10 : x
  2. Step 2: Convert to fraction form
    85,839.10/128,758.65 = 84,381.10/x
  3. Step 3: Cross multiply
    85,839.10x = 128,758.65 × 84,381.10
  4. Step 4: Simplify right side
    85,839.10x = 10,864,796,521.52
  5. Step 5: Solve for x
    x = 10,864,796,521.52/85,839.10
  6. Step 6: Final answer
    x = 126,571.65

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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.