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Finding the Fourth Proportional to 1,152.80, 1,729.20 and 287.11

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Solution

The fourth proportional to 1,152.80, 1,729.20 and 287.11 is: 430.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,152.80 : 1,729.20 = 287.11 : x
  2. Step 2: Convert to fraction form
    1,152.80/1,729.20 = 287.11/x
  3. Step 3: Cross multiply
    1,152.80x = 1,729.20 × 287.11
  4. Step 4: Simplify right side
    1,152.80x = 496,470.61
  5. Step 5: Solve for x
    x = 496,470.61/1,152.80
  6. Step 6: Final answer
    x = 430.67

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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.