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Finding the Fourth Proportional to 1,118.79, 1,678.32 and 388.11

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Solution

The fourth proportional to 1,118.79, 1,678.32 and 388.11 is: 582.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,118.79 : 1,678.32 = 388.11 : x
  2. Step 2: Convert to fraction form
    1,118.79/1,678.32 = 388.11/x
  3. Step 3: Cross multiply
    1,118.79x = 1,678.32 × 388.11
  4. Step 4: Simplify right side
    1,118.79x = 651,372.78
  5. Step 5: Solve for x
    x = 651,372.78/1,118.79
  6. Step 6: Final answer
    x = 582.21

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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.