Home / 1,421.19-1,961.51-800.19

Finding the Fourth Proportional to 1,421.19, 1,961.51 and 800.19

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Solution

The fourth proportional to 1,421.19, 1,961.51 and 800.19 is: 1,104.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,421.19 : 1,961.51 = 800.19 : x
  2. Step 2: Convert to fraction form
    1,421.19/1,961.51 = 800.19/x
  3. Step 3: Cross multiply
    1,421.19x = 1,961.51 × 800.19
  4. Step 4: Simplify right side
    1,421.19x = 1,569,580.69
  5. Step 5: Solve for x
    x = 1,569,580.69/1,421.19
  6. Step 6: Final answer
    x = 1,104.41

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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.