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Finding the Fourth Proportional to 847.28, 1,169.16 and 515.72

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Solution

The fourth proportional to 847.28, 1,169.16 and 515.72 is: 711.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    847.28 : 1,169.16 = 515.72 : x
  2. Step 2: Convert to fraction form
    847.28/1,169.16 = 515.72/x
  3. Step 3: Cross multiply
    847.28x = 1,169.16 × 515.72
  4. Step 4: Simplify right side
    847.28x = 602,959.20
  5. Step 5: Solve for x
    x = 602,959.20/847.28
  6. Step 6: Final answer
    x = 711.64

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.