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Finding the Fourth Proportional to 679.79, 1,020.14 and 402.32

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Solution

The fourth proportional to 679.79, 1,020.14 and 402.32 is: 603.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    679.79 : 1,020.14 = 402.32 : x
  2. Step 2: Convert to fraction form
    679.79/1,020.14 = 402.32/x
  3. Step 3: Cross multiply
    679.79x = 1,020.14 × 402.32
  4. Step 4: Simplify right side
    679.79x = 410,422.72
  5. Step 5: Solve for x
    x = 410,422.72/679.79
  6. Step 6: Final answer
    x = 603.75

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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.