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Finding the Fourth Proportional to 667.90, 920.55 and 613.18

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Solution

The fourth proportional to 667.90, 920.55 and 613.18 is: 845.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    667.90 : 920.55 = 613.18 : x
  2. Step 2: Convert to fraction form
    667.90/920.55 = 613.18/x
  3. Step 3: Cross multiply
    667.90x = 920.55 × 613.18
  4. Step 4: Simplify right side
    667.90x = 564,462.85
  5. Step 5: Solve for x
    x = 564,462.85/667.90
  6. Step 6: Final answer
    x = 845.13

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1.5x scale

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.