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Finding the Fourth Proportional to 718.84, 1,078.38 and 389.86

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Solution

The fourth proportional to 718.84, 1,078.38 and 389.86 is: 584.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    718.84 : 1,078.38 = 389.86 : x
  2. Step 2: Convert to fraction form
    718.84/1,078.38 = 389.86/x
  3. Step 3: Cross multiply
    718.84x = 1,078.38 × 389.86
  4. Step 4: Simplify right side
    718.84x = 420,417.23
  5. Step 5: Solve for x
    x = 420,417.23/718.84
  6. Step 6: Final answer
    x = 584.86

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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.