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Finding the Fourth Proportional to 719.31, 1,079.13 and 257.12

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Solution

The fourth proportional to 719.31, 1,079.13 and 257.12 is: 385.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    719.31 : 1,079.13 = 257.12 : x
  2. Step 2: Convert to fraction form
    719.31/1,079.13 = 257.12/x
  3. Step 3: Cross multiply
    719.31x = 1,079.13 × 257.12
  4. Step 4: Simplify right side
    719.31x = 277,460.51
  5. Step 5: Solve for x
    x = 277,460.51/719.31
  6. Step 6: Final answer
    x = 385.73

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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.