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Finding the Fourth Proportional to 1,390.17, 2,084.22 and 842.22

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Solution

The fourth proportional to 1,390.17, 2,084.22 and 842.22 is: 1,262.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,390.17 : 2,084.22 = 842.22 : x
  2. Step 2: Convert to fraction form
    1,390.17/2,084.22 = 842.22/x
  3. Step 3: Cross multiply
    1,390.17x = 2,084.22 × 842.22
  4. Step 4: Simplify right side
    1,390.17x = 1,755,371.77
  5. Step 5: Solve for x
    x = 1,755,371.77/1,390.17
  6. Step 6: Final answer
    x = 1,262.70

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1.5x scale

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.