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Finding the Fourth Proportional to 945.85, 1,418.89 and 397.89

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Solution

The fourth proportional to 945.85, 1,418.89 and 397.89 is: 596.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    945.85 : 1,418.89 = 397.89 : x
  2. Step 2: Convert to fraction form
    945.85/1,418.89 = 397.89/x
  3. Step 3: Cross multiply
    945.85x = 1,418.89 × 397.89
  4. Step 4: Simplify right side
    945.85x = 564,554.05
  5. Step 5: Solve for x
    x = 564,554.05/945.85
  6. Step 6: Final answer
    x = 596.87

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Double scale
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Similar ratio
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1.5x scale

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.