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Finding the Fourth Proportional to 1,306.90, 1,805.24 and 974.75

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Solution

The fourth proportional to 1,306.90, 1,805.24 and 974.75 is: 1,346.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,306.90 : 1,805.24 = 974.75 : x
  2. Step 2: Convert to fraction form
    1,306.90/1,805.24 = 974.75/x
  3. Step 3: Cross multiply
    1,306.90x = 1,805.24 × 974.75
  4. Step 4: Simplify right side
    1,306.90x = 1,759,657.69
  5. Step 5: Solve for x
    x = 1,759,657.69/1,306.90
  6. Step 6: Final answer
    x = 1,346.44

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Half scale
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Double scale
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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.