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Finding the Fourth Proportional to 1,118.71, 1,678.11 and 533.78

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Solution

The fourth proportional to 1,118.71, 1,678.11 and 533.78 is: 800.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,118.71 : 1,678.11 = 533.78 : x
  2. Step 2: Convert to fraction form
    1,118.71/1,678.11 = 533.78/x
  3. Step 3: Cross multiply
    1,118.71x = 1,678.11 × 533.78
  4. Step 4: Simplify right side
    1,118.71x = 895,741.56
  5. Step 5: Solve for x
    x = 895,741.56/1,118.71
  6. Step 6: Final answer
    x = 800.69

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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.