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Finding the Fourth Proportional to 1,081.71, 1,622.57 and 432.45

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Solution

The fourth proportional to 1,081.71, 1,622.57 and 432.45 is: 648.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,081.71 : 1,622.57 = 432.45 : x
  2. Step 2: Convert to fraction form
    1,081.71/1,622.57 = 432.45/x
  3. Step 3: Cross multiply
    1,081.71x = 1,622.57 × 432.45
  4. Step 4: Simplify right side
    1,081.71x = 701,680.40
  5. Step 5: Solve for x
    x = 701,680.40/1,081.71
  6. Step 6: Final answer
    x = 648.68

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Double scale
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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.