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Finding the Fourth Proportional to 38,488.80, 57,749.40 and 20,971.20

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Solution

The fourth proportional to 38,488.80, 57,749.40 and 20,971.20 is: 31,465.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    38,488.80 : 57,749.40 = 20,971.20 : x
  2. Step 2: Convert to fraction form
    38,488.80/57,749.40 = 20,971.20/x
  3. Step 3: Cross multiply
    38,488.80x = 57,749.40 × 20,971.20
  4. Step 4: Simplify right side
    38,488.80x = 1,211,074,217.28
  5. Step 5: Solve for x
    x = 1,211,074,217.28/38,488.80
  6. Step 6: Final answer
    x = 31,465.63

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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.