Home / 1,390.13-1,918.38-800.66

Finding the Fourth Proportional to 1,390.13, 1,918.38 and 800.66

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Solution

The fourth proportional to 1,390.13, 1,918.38 and 800.66 is: 1,104.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,390.13 : 1,918.38 = 800.66 : x
  2. Step 2: Convert to fraction form
    1,390.13/1,918.38 = 800.66/x
  3. Step 3: Cross multiply
    1,390.13x = 1,918.38 × 800.66
  4. Step 4: Simplify right side
    1,390.13x = 1,535,960.54
  5. Step 5: Solve for x
    x = 1,535,960.54/1,390.13
  6. Step 6: Final answer
    x = 1,104.91

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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.