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Finding the Fourth Proportional to 1,386.14, 2,078.11 and 800.48

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Solution

The fourth proportional to 1,386.14, 2,078.11 and 800.48 is: 1,200.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,386.14 : 2,078.11 = 800.48 : x
  2. Step 2: Convert to fraction form
    1,386.14/2,078.11 = 800.48/x
  3. Step 3: Cross multiply
    1,386.14x = 2,078.11 × 800.48
  4. Step 4: Simplify right side
    1,386.14x = 1,663,480.30
  5. Step 5: Solve for x
    x = 1,663,480.30/1,386.14
  6. Step 6: Final answer
    x = 1,200.08

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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.