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Finding the Fourth Proportional to 1,317.35, 1,976.02 and 905.24

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Solution

The fourth proportional to 1,317.35, 1,976.02 and 905.24 is: 1,357.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,317.35 : 1,976.02 = 905.24 : x
  2. Step 2: Convert to fraction form
    1,317.35/1,976.02 = 905.24/x
  3. Step 3: Cross multiply
    1,317.35x = 1,976.02 × 905.24
  4. Step 4: Simplify right side
    1,317.35x = 1,788,760.20
  5. Step 5: Solve for x
    x = 1,788,760.20/1,317.35
  6. Step 6: Final answer
    x = 1,357.85

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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.