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Finding the Fourth Proportional to 679.61, 938.30 and 418.07

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Solution

The fourth proportional to 679.61, 938.30 and 418.07 is: 577.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    679.61 : 938.30 = 418.07 : x
  2. Step 2: Convert to fraction form
    679.61/938.30 = 418.07/x
  3. Step 3: Cross multiply
    679.61x = 938.30 × 418.07
  4. Step 4: Simplify right side
    679.61x = 392,268.30
  5. Step 5: Solve for x
    x = 392,268.30/679.61
  6. Step 6: Final answer
    x = 577.20

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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.