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Finding the Fourth Proportional to 55,987.20, 83,948.40 and 20,930.40

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Solution

The fourth proportional to 55,987.20, 83,948.40 and 20,930.40 is: 31,383.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    55,987.20 : 83,948.40 = 20,930.40 : x
  2. Step 2: Convert to fraction form
    55,987.20/83,948.40 = 20,930.40/x
  3. Step 3: Cross multiply
    55,987.20x = 83,948.40 × 20,930.40
  4. Step 4: Simplify right side
    55,987.20x = 1,757,073,591.36
  5. Step 5: Solve for x
    x = 1,757,073,591.36/55,987.20
  6. Step 6: Final answer
    x = 31,383.49

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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.