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Finding the Fourth Proportional to 718.99, 1,078.49 and 328.91

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Solution

The fourth proportional to 718.99, 1,078.49 and 328.91 is: 493.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    718.99 : 1,078.49 = 328.91 : x
  2. Step 2: Convert to fraction form
    718.99/1,078.49 = 328.91/x
  3. Step 3: Cross multiply
    718.99x = 1,078.49 × 328.91
  4. Step 4: Simplify right side
    718.99x = 354,726.15
  5. Step 5: Solve for x
    x = 354,726.15/718.99
  6. Step 6: Final answer
    x = 493.37

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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.