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Finding the Fourth Proportional to 1,386.32, 2,079.49 and 461.87

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Solution

The fourth proportional to 1,386.32, 2,079.49 and 461.87 is: 692.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,386.32 : 2,079.49 = 461.87 : x
  2. Step 2: Convert to fraction form
    1,386.32/2,079.49 = 461.87/x
  3. Step 3: Cross multiply
    1,386.32x = 2,079.49 × 461.87
  4. Step 4: Simplify right side
    1,386.32x = 960,458.09
  5. Step 5: Solve for x
    x = 960,458.09/1,386.32
  6. Step 6: Final answer
    x = 692.81

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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.