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Finding the Fourth Proportional to 1,081.24, 1,622.62 and 432.12

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Solution

The fourth proportional to 1,081.24, 1,622.62 and 432.12 is: 648.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,081.24 : 1,622.62 = 432.12 : x
  2. Step 2: Convert to fraction form
    1,081.24/1,622.62 = 432.12/x
  3. Step 3: Cross multiply
    1,081.24x = 1,622.62 × 432.12
  4. Step 4: Simplify right side
    1,081.24x = 701,166.55
  5. Step 5: Solve for x
    x = 701,166.55/1,081.24
  6. Step 6: Final answer
    x = 648.48

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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.