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Finding the Fourth Proportional to 38,479.40, 57,719.10 and 20,983.40

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Solution

The fourth proportional to 38,479.40, 57,719.10 and 20,983.40 is: 31,475.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    38,479.40 : 57,719.10 = 20,983.40 : x
  2. Step 2: Convert to fraction form
    38,479.40/57,719.10 = 20,983.40/x
  3. Step 3: Cross multiply
    38,479.40x = 57,719.10 × 20,983.40
  4. Step 4: Simplify right side
    38,479.40x = 1,211,142,962.94
  5. Step 5: Solve for x
    x = 1,211,142,962.94/38,479.40
  6. Step 6: Final answer
    x = 31,475.10

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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.