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Finding the Fourth Proportional to 1,129.20, 1,693.98 and 435.84

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Solution

The fourth proportional to 1,129.20, 1,693.98 and 435.84 is: 653.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,129.20 : 1,693.98 = 435.84 : x
  2. Step 2: Convert to fraction form
    1,129.20/1,693.98 = 435.84/x
  3. Step 3: Cross multiply
    1,129.20x = 1,693.98 × 435.84
  4. Step 4: Simplify right side
    1,129.20x = 738,304.24
  5. Step 5: Solve for x
    x = 738,304.24/1,129.20
  6. Step 6: Final answer
    x = 653.83

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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.