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Finding the Fourth Proportional to 1,318.76, 1,820.12 and 759.18

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Solution

The fourth proportional to 1,318.76, 1,820.12 and 759.18 is: 1,047.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,318.76 : 1,820.12 = 759.18 : x
  2. Step 2: Convert to fraction form
    1,318.76/1,820.12 = 759.18/x
  3. Step 3: Cross multiply
    1,318.76x = 1,820.12 × 759.18
  4. Step 4: Simplify right side
    1,318.76x = 1,381,794.91
  5. Step 5: Solve for x
    x = 1,381,794.91/1,318.76
  6. Step 6: Final answer
    x = 1,047.80

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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.