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Finding the Fourth Proportional to 1,147.65, 1,720.30 and 454.05

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Solution

The fourth proportional to 1,147.65, 1,720.30 and 454.05 is: 680.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,147.65 : 1,720.30 = 454.05 : x
  2. Step 2: Convert to fraction form
    1,147.65/1,720.30 = 454.05/x
  3. Step 3: Cross multiply
    1,147.65x = 1,720.30 × 454.05
  4. Step 4: Simplify right side
    1,147.65x = 781,102.22
  5. Step 5: Solve for x
    x = 781,102.22/1,147.65
  6. Step 6: Final answer
    x = 680.61

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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.