Home / 1,118.16-1,677.43-387.54

Finding the Fourth Proportional to 1,118.16, 1,677.43 and 387.54

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Solution

The fourth proportional to 1,118.16, 1,677.43 and 387.54 is: 581.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,118.16 : 1,677.43 = 387.54 : x
  2. Step 2: Convert to fraction form
    1,118.16/1,677.43 = 387.54/x
  3. Step 3: Cross multiply
    1,118.16x = 1,677.43 × 387.54
  4. Step 4: Simplify right side
    1,118.16x = 650,071.22
  5. Step 5: Solve for x
    x = 650,071.22/1,118.16
  6. Step 6: Final answer
    x = 581.38

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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.