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Finding the Fourth Proportional to 38,638.70, 57,925.65 and 20,170.70

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Solution

The fourth proportional to 38,638.70, 57,925.65 and 20,170.70 is: 30,239.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    38,638.70 : 57,925.65 = 20,170.70 : x
  2. Step 2: Convert to fraction form
    38,638.70/57,925.65 = 20,170.70/x
  3. Step 3: Cross multiply
    38,638.70x = 57,925.65 × 20,170.70
  4. Step 4: Simplify right side
    38,638.70x = 1,168,400,908.46
  5. Step 5: Solve for x
    x = 1,168,400,908.46/38,638.70
  6. Step 6: Final answer
    x = 30,239.14

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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.