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Finding the Fourth Proportional to 679.16, 1,017.42 and 447.35

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Solution

The fourth proportional to 679.16, 1,017.42 and 447.35 is: 670.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    679.16 : 1,017.42 = 447.35 : x
  2. Step 2: Convert to fraction form
    679.16/1,017.42 = 447.35/x
  3. Step 3: Cross multiply
    679.16x = 1,017.42 × 447.35
  4. Step 4: Simplify right side
    679.16x = 455,137.75
  5. Step 5: Solve for x
    x = 455,137.75/679.16
  6. Step 6: Final answer
    x = 670.15

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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.