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Finding the Fourth Proportional to 20,719.40, 31,079.10 and 15,535.40

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Solution

The fourth proportional to 20,719.40, 31,079.10 and 15,535.40 is: 23,303.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,719.40 : 31,079.10 = 15,535.40 : x
  2. Step 2: Convert to fraction form
    20,719.40/31,079.10 = 15,535.40/x
  3. Step 3: Cross multiply
    20,719.40x = 31,079.10 × 15,535.40
  4. Step 4: Simplify right side
    20,719.40x = 482,826,250.14
  5. Step 5: Solve for x
    x = 482,826,250.14/20,719.40
  6. Step 6: Final answer
    x = 23,303.10

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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.