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Finding the Fourth Proportional to 687.58, 948.74 and 392.83

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Solution

The fourth proportional to 687.58, 948.74 and 392.83 is: 542.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    687.58 : 948.74 = 392.83 : x
  2. Step 2: Convert to fraction form
    687.58/948.74 = 392.83/x
  3. Step 3: Cross multiply
    687.58x = 948.74 × 392.83
  4. Step 4: Simplify right side
    687.58x = 372,689.20
  5. Step 5: Solve for x
    x = 372,689.20/687.58
  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.