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Finding the Fourth Proportional to 85,882.80, 128,824.20 and 53,114.80

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Solution

The fourth proportional to 85,882.80, 128,824.20 and 53,114.80 is: 79,672.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,882.80 : 128,824.20 = 53,114.80 : x
  2. Step 2: Convert to fraction form
    85,882.80/128,824.20 = 53,114.80/x
  3. Step 3: Cross multiply
    85,882.80x = 128,824.20 × 53,114.80
  4. Step 4: Simplify right side
    85,882.80x = 6,842,471,618.16
  5. Step 5: Solve for x
    x = 6,842,471,618.16/85,882.80
  6. Step 6: Final answer
    x = 79,672.20

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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.