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Finding the Fourth Proportional to 719.88, 1,079.64 and 257.52

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Solution

The fourth proportional to 719.88, 1,079.64 and 257.52 is: 386.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    719.88 : 1,079.64 = 257.52 : x
  2. Step 2: Convert to fraction form
    719.88/1,079.64 = 257.52/x
  3. Step 3: Cross multiply
    719.88x = 1,079.64 × 257.52
  4. Step 4: Simplify right side
    719.88x = 278,028.89
  5. Step 5: Solve for x
    x = 278,028.89/719.88
  6. Step 6: Final answer
    x = 386.22

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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.