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Finding the Fourth Proportional to 1,517.48, 2,275.94 and 421.72

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Solution

The fourth proportional to 1,517.48, 2,275.94 and 421.72 is: 632.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,517.48 : 2,275.94 = 421.72 : x
  2. Step 2: Convert to fraction form
    1,517.48/2,275.94 = 421.72/x
  3. Step 3: Cross multiply
    1,517.48x = 2,275.94 × 421.72
  4. Step 4: Simplify right side
    1,517.48x = 959,809.42
  5. Step 5: Solve for x
    x = 959,809.42/1,517.48
  6. Step 6: Final answer
    x = 632.50

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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.