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Finding the Fourth Proportional to 718.61, 1,078.25 and 256.57

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Solution

The fourth proportional to 718.61, 1,078.25 and 256.57 is: 384.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    718.61 : 1,078.25 = 256.57 : x
  2. Step 2: Convert to fraction form
    718.61/1,078.25 = 256.57/x
  3. Step 3: Cross multiply
    718.61x = 1,078.25 × 256.57
  4. Step 4: Simplify right side
    718.61x = 276,642.62
  5. Step 5: Solve for x
    x = 276,642.62/718.61
  6. Step 6: Final answer
    x = 384.97

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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.