Home / 1,126.20-1,688.10-432.60

Finding the Fourth Proportional to 1,126.20, 1,688.10 and 432.60

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Solution

The fourth proportional to 1,126.20, 1,688.10 and 432.60 is: 648.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,126.20 : 1,688.10 = 432.60 : x
  2. Step 2: Convert to fraction form
    1,126.20/1,688.10 = 432.60/x
  3. Step 3: Cross multiply
    1,126.20x = 1,688.10 × 432.60
  4. Step 4: Simplify right side
    1,126.20x = 730,272.06
  5. Step 5: Solve for x
    x = 730,272.06/1,126.20
  6. Step 6: Final answer
    x = 648.44

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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.