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Finding the Fourth Proportional to 687.48, 949.74 and 540.12

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Solution

The fourth proportional to 687.48, 949.74 and 540.12 is: 746.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    687.48 : 949.74 = 540.12 : x
  2. Step 2: Convert to fraction form
    687.48/949.74 = 540.12/x
  3. Step 3: Cross multiply
    687.48x = 949.74 × 540.12
  4. Step 4: Simplify right side
    687.48x = 512,973.57
  5. Step 5: Solve for x
    x = 512,973.57/687.48
  6. Step 6: Final answer
    x = 746.17

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.