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Finding the Fourth Proportional to 851.98, 1,278 and 358.18

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Solution

The fourth proportional to 851.98, 1,278 and 358.18 is: 537.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    851.98 : 1,278 = 358.18 : x
  2. Step 2: Convert to fraction form
    851.98/1,278 = 358.18/x
  3. Step 3: Cross multiply
    851.98x = 1,278 × 358.18
  4. Step 4: Simplify right side
    851.98x = 457,754.04
  5. Step 5: Solve for x
    x = 457,754.04/851.98
  6. Step 6: Final answer
    x = 537.28

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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.