Home / 1,517.11-2,275.54-421.50

Finding the Fourth Proportional to 1,517.11, 2,275.54 and 421.50

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Solution

The fourth proportional to 1,517.11, 2,275.54 and 421.50 is: 632.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,517.11 : 2,275.54 = 421.50 : x
  2. Step 2: Convert to fraction form
    1,517.11/2,275.54 = 421.50/x
  3. Step 3: Cross multiply
    1,517.11x = 2,275.54 × 421.50
  4. Step 4: Simplify right side
    1,517.11x = 959,140.11
  5. Step 5: Solve for x
    x = 959,140.11/1,517.11
  6. Step 6: Final answer
    x = 632.22

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Double scale
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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.