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Finding the Fourth Proportional to 20,728.40, 31,169.40 and 17,349.20

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Solution

The fourth proportional to 20,728.40, 31,169.40 and 17,349.20 is: 26,088.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,728.40 : 31,169.40 = 17,349.20 : x
  2. Step 2: Convert to fraction form
    20,728.40/31,169.40 = 17,349.20/x
  3. Step 3: Cross multiply
    20,728.40x = 31,169.40 × 17,349.20
  4. Step 4: Simplify right side
    20,728.40x = 540,764,154.48
  5. Step 5: Solve for x
    x = 540,764,154.48/20,728.40
  6. Step 6: Final answer
    x = 26,088.08

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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.