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Finding the Fourth Proportional to 1,118.92, 1,678.38 and 387.98

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Solution

The fourth proportional to 1,118.92, 1,678.38 and 387.98 is: 581.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,118.92 : 1,678.38 = 387.98 : x
  2. Step 2: Convert to fraction form
    1,118.92/1,678.38 = 387.98/x
  3. Step 3: Cross multiply
    1,118.92x = 1,678.38 × 387.98
  4. Step 4: Simplify right side
    1,118.92x = 651,187.03
  5. Step 5: Solve for x
    x = 651,187.03/1,118.92
  6. Step 6: Final answer
    x = 581.98

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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.