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Finding the Fourth Proportional to 1,119.70, 1,678.51 and 388.76

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Solution

The fourth proportional to 1,119.70, 1,678.51 and 388.76 is: 582.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,119.70 : 1,678.51 = 388.76 : x
  2. Step 2: Convert to fraction form
    1,119.70/1,678.51 = 388.76/x
  3. Step 3: Cross multiply
    1,119.70x = 1,678.51 × 388.76
  4. Step 4: Simplify right side
    1,119.70x = 652,535.60
  5. Step 5: Solve for x
    x = 652,535.60/1,119.70
  6. Step 6: Final answer
    x = 582.78

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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.