Home / 1,678.18-2,315.87-932.11

Finding the Fourth Proportional to 1,678.18, 2,315.87 and 932.11

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Solution

The fourth proportional to 1,678.18, 2,315.87 and 932.11 is: 1,286.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,678.18 : 2,315.87 = 932.11 : x
  2. Step 2: Convert to fraction form
    1,678.18/2,315.87 = 932.11/x
  3. Step 3: Cross multiply
    1,678.18x = 2,315.87 × 932.11
  4. Step 4: Simplify right side
    1,678.18x = 2,158,635.14
  5. Step 5: Solve for x
    x = 2,158,635.14/1,678.18
  6. Step 6: Final answer
    x = 1,286.30

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.