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Finding the Fourth Proportional to 679.08, 1,018.62 and 392.52

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Solution

The fourth proportional to 679.08, 1,018.62 and 392.52 is: 588.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    679.08 : 1,018.62 = 392.52 : x
  2. Step 2: Convert to fraction form
    679.08/1,018.62 = 392.52/x
  3. Step 3: Cross multiply
    679.08x = 1,018.62 × 392.52
  4. Step 4: Simplify right side
    679.08x = 399,828.72
  5. Step 5: Solve for x
    x = 399,828.72/679.08
  6. Step 6: Final answer
    x = 588.78

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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.