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Finding the Fourth Proportional to 1,129.75, 1,693.33 and 436.08

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Solution

The fourth proportional to 1,129.75, 1,693.33 and 436.08 is: 653.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,129.75 : 1,693.33 = 436.08 : x
  2. Step 2: Convert to fraction form
    1,129.75/1,693.33 = 436.08/x
  3. Step 3: Cross multiply
    1,129.75x = 1,693.33 × 436.08
  4. Step 4: Simplify right side
    1,129.75x = 738,416.70
  5. Step 5: Solve for x
    x = 738,416.70/1,129.75
  6. Step 6: Final answer
    x = 653.61

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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.