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Finding the Fourth Proportional to 55,412.80, 83,119.20 and 20,347.90

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Solution

The fourth proportional to 55,412.80, 83,119.20 and 20,347.90 is: 30,521.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    55,412.80 : 83,119.20 = 20,347.90 : x
  2. Step 2: Convert to fraction form
    55,412.80/83,119.20 = 20,347.90/x
  3. Step 3: Cross multiply
    55,412.80x = 83,119.20 × 20,347.90
  4. Step 4: Simplify right side
    55,412.80x = 1,691,301,169.68
  5. Step 5: Solve for x
    x = 1,691,301,169.68/55,412.80
  6. Step 6: Final answer
    x = 30,521.85

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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.