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Finding the Fourth Proportional to 687.48, 948.72 and 392.77

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Solution

The fourth proportional to 687.48, 948.72 and 392.77 is: 542.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    687.48 : 948.72 = 392.77 : x
  2. Step 2: Convert to fraction form
    687.48/948.72 = 392.77/x
  3. Step 3: Cross multiply
    687.48x = 948.72 × 392.77
  4. Step 4: Simplify right side
    687.48x = 372,628.75
  5. Step 5: Solve for x
    x = 372,628.75/687.48
  6. Step 6: Final answer
    x = 542.03

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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.