Home / 1,517.18-2,275.48-421.28

Finding the Fourth Proportional to 1,517.18, 2,275.48 and 421.28

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Solution

The fourth proportional to 1,517.18, 2,275.48 and 421.28 is: 631.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,517.18 : 2,275.48 = 421.28 : x
  2. Step 2: Convert to fraction form
    1,517.18/2,275.48 = 421.28/x
  3. Step 3: Cross multiply
    1,517.18x = 2,275.48 × 421.28
  4. Step 4: Simplify right side
    1,517.18x = 958,614.21
  5. Step 5: Solve for x
    x = 958,614.21/1,517.18
  6. Step 6: Final answer
    x = 631.84

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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.