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Finding the Fourth Proportional to 718.56, 1,078.20 and 256.32

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Solution

The fourth proportional to 718.56, 1,078.20 and 256.32 is: 384.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    718.56 : 1,078.20 = 256.32 : x
  2. Step 2: Convert to fraction form
    718.56/1,078.20 = 256.32/x
  3. Step 3: Cross multiply
    718.56x = 1,078.20 × 256.32
  4. Step 4: Simplify right side
    718.56x = 276,364.22
  5. Step 5: Solve for x
    x = 276,364.22/718.56
  6. Step 6: Final answer
    x = 384.61

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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.