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Finding the Fourth Proportional to 85,523.80, 128,139.90 and 70,652.20

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Solution

The fourth proportional to 85,523.80, 128,139.90 and 70,652.20 is: 105,857.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,523.80 : 128,139.90 = 70,652.20 : x
  2. Step 2: Convert to fraction form
    85,523.80/128,139.90 = 70,652.20/x
  3. Step 3: Cross multiply
    85,523.80x = 128,139.90 × 70,652.20
  4. Step 4: Simplify right side
    85,523.80x = 9,053,365,842.78
  5. Step 5: Solve for x
    x = 9,053,365,842.78/85,523.80
  6. Step 6: Final answer
    x = 105,857.85

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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.