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Finding the Fourth Proportional to 1,147.20, 1,720.17 and 453.17

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Solution

The fourth proportional to 1,147.20, 1,720.17 and 453.17 is: 679.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,147.20 : 1,720.17 = 453.17 : x
  2. Step 2: Convert to fraction form
    1,147.20/1,720.17 = 453.17/x
  3. Step 3: Cross multiply
    1,147.20x = 1,720.17 × 453.17
  4. Step 4: Simplify right side
    1,147.20x = 779,520.84
  5. Step 5: Solve for x
    x = 779,520.84/1,147.20
  6. Step 6: Final answer
    x = 679.50

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Double scale
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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.