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Finding the Fourth Proportional to 85,647.40, 128,471.10 and 82,148.20

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Solution

The fourth proportional to 85,647.40, 128,471.10 and 82,148.20 is: 123,222.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,647.40 : 128,471.10 = 82,148.20 : x
  2. Step 2: Convert to fraction form
    85,647.40/128,471.10 = 82,148.20/x
  3. Step 3: Cross multiply
    85,647.40x = 128,471.10 × 82,148.20
  4. Step 4: Simplify right side
    85,647.40x = 10,553,669,617.02
  5. Step 5: Solve for x
    x = 10,553,669,617.02/85,647.40
  6. Step 6: Final answer
    x = 123,222.30

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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.