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Finding the Fourth Proportional to 718.55, 1,077.91 and 256.40

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Solution

The fourth proportional to 718.55, 1,077.91 and 256.40 is: 384.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    718.55 : 1,077.91 = 256.40 : x
  2. Step 2: Convert to fraction form
    718.55/1,077.91 = 256.40/x
  3. Step 3: Cross multiply
    718.55x = 1,077.91 × 256.40
  4. Step 4: Simplify right side
    718.55x = 276,370.09
  5. Step 5: Solve for x
    x = 276,370.09/718.55
  6. Step 6: Final answer
    x = 384.62

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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.