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Finding the Fourth Proportional to 719.65, 1,079.44 and 257.43

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Solution

The fourth proportional to 719.65, 1,079.44 and 257.43 is: 386.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    719.65 : 1,079.44 = 257.43 : x
  2. Step 2: Convert to fraction form
    719.65/1,079.44 = 257.43/x
  3. Step 3: Cross multiply
    719.65x = 1,079.44 × 257.43
  4. Step 4: Simplify right side
    719.65x = 277,880.24
  5. Step 5: Solve for x
    x = 277,880.24/719.65
  6. Step 6: Final answer
    x = 386.13

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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.