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Finding the Fourth Proportional to 864.88, 1,193.64 and 515.56

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Solution

The fourth proportional to 864.88, 1,193.64 and 515.56 is: 711.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    864.88 : 1,193.64 = 515.56 : x
  2. Step 2: Convert to fraction form
    864.88/1,193.64 = 515.56/x
  3. Step 3: Cross multiply
    864.88x = 1,193.64 × 515.56
  4. Step 4: Simplify right side
    864.88x = 615,393.04
  5. Step 5: Solve for x
    x = 615,393.04/864.88
  6. Step 6: Final answer
    x = 711.54

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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.