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Finding the Fourth Proportional to 713.20, 1,070 and 251

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Solution

The fourth proportional to 713.20, 1,070 and 251 is: 376.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    713.20 : 1,070 = 251 : x
  2. Step 2: Convert to fraction form
    713.20/1,070 = 251/x
  3. Step 3: Cross multiply
    713.20x = 1,070 × 251
  4. Step 4: Simplify right side
    713.20x = 268,570
  5. Step 5: Solve for x
    x = 268,570/713.20
  6. Step 6: Final answer
    x = 376.57

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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.