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Finding the Fourth Proportional to 905.70, 1,358.55 and 418.48

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Solution

The fourth proportional to 905.70, 1,358.55 and 418.48 is: 627.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    905.70 : 1,358.55 = 418.48 : x
  2. Step 2: Convert to fraction form
    905.70/1,358.55 = 418.48/x
  3. Step 3: Cross multiply
    905.70x = 1,358.55 × 418.48
  4. Step 4: Simplify right side
    905.70x = 568,526.00
  5. Step 5: Solve for x
    x = 568,526.00/905.70
  6. Step 6: Final answer
    x = 627.72

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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.