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Finding the Fourth Proportional to 718.35, 1,077.65 and 256.13

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Solution

The fourth proportional to 718.35, 1,077.65 and 256.13 is: 384.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    718.35 : 1,077.65 = 256.13 : x
  2. Step 2: Convert to fraction form
    718.35/1,077.65 = 256.13/x
  3. Step 3: Cross multiply
    718.35x = 1,077.65 × 256.13
  4. Step 4: Simplify right side
    718.35x = 276,018.49
  5. Step 5: Solve for x
    x = 276,018.49/718.35
  6. Step 6: Final answer
    x = 384.24

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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.