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Finding the Fourth Proportional to 718.49, 1,076.99 and 393.17

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Solution

The fourth proportional to 718.49, 1,076.99 and 393.17 is: 589.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    718.49 : 1,076.99 = 393.17 : x
  2. Step 2: Convert to fraction form
    718.49/1,076.99 = 393.17/x
  3. Step 3: Cross multiply
    718.49x = 1,076.99 × 393.17
  4. Step 4: Simplify right side
    718.49x = 423,432.81
  5. Step 5: Solve for x
    x = 423,432.81/718.49
  6. Step 6: Final answer
    x = 589.34

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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.