Home / 1,390.14-1,918.26-800.19

Finding the Fourth Proportional to 1,390.14, 1,918.26 and 800.19

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Solution

The fourth proportional to 1,390.14, 1,918.26 and 800.19 is: 1,104.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,390.14 : 1,918.26 = 800.19 : x
  2. Step 2: Convert to fraction form
    1,390.14/1,918.26 = 800.19/x
  3. Step 3: Cross multiply
    1,390.14x = 1,918.26 × 800.19
  4. Step 4: Simplify right side
    1,390.14x = 1,534,972.47
  5. Step 5: Solve for x
    x = 1,534,972.47/1,390.14
  6. Step 6: Final answer
    x = 1,104.19

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Half scale
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Double scale
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1.5x scale

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.