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Finding the Fourth Proportional to 1,161.76, 1,742.88 and 512.16

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Solution

The fourth proportional to 1,161.76, 1,742.88 and 512.16 is: 768.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,161.76 : 1,742.88 = 512.16 : x
  2. Step 2: Convert to fraction form
    1,161.76/1,742.88 = 512.16/x
  3. Step 3: Cross multiply
    1,161.76x = 1,742.88 × 512.16
  4. Step 4: Simplify right side
    1,161.76x = 892,633.42
  5. Step 5: Solve for x
    x = 892,633.42/1,161.76
  6. Step 6: Final answer
    x = 768.35

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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.