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Finding the Fourth Proportional to 20,079.64, 30,119.28 and 15,700.78

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Solution

The fourth proportional to 20,079.64, 30,119.28 and 15,700.78 is: 23,551.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,079.64 : 30,119.28 = 15,700.78 : x
  2. Step 2: Convert to fraction form
    20,079.64/30,119.28 = 15,700.78/x
  3. Step 3: Cross multiply
    20,079.64x = 30,119.28 × 15,700.78
  4. Step 4: Simplify right side
    20,079.64x = 472,896,189.04
  5. Step 5: Solve for x
    x = 472,896,189.04/20,079.64
  6. Step 6: Final answer
    x = 23,551.03

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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.