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Finding the Fourth Proportional to 696.12, 1,043.68 and 257.16

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Solution

The fourth proportional to 696.12, 1,043.68 and 257.16 is: 385.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    696.12 : 1,043.68 = 257.16 : x
  2. Step 2: Convert to fraction form
    696.12/1,043.68 = 257.16/x
  3. Step 3: Cross multiply
    696.12x = 1,043.68 × 257.16
  4. Step 4: Simplify right side
    696.12x = 268,392.75
  5. Step 5: Solve for x
    x = 268,392.75/696.12
  6. Step 6: Final answer
    x = 385.56

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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.