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Finding the Fourth Proportional to 1,422.12, 1,963.20 and 898.38

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Solution

The fourth proportional to 1,422.12, 1,963.20 and 898.38 is: 1,240.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,422.12 : 1,963.20 = 898.38 : x
  2. Step 2: Convert to fraction form
    1,422.12/1,963.20 = 898.38/x
  3. Step 3: Cross multiply
    1,422.12x = 1,963.20 × 898.38
  4. Step 4: Simplify right side
    1,422.12x = 1,763,699.62
  5. Step 5: Solve for x
    x = 1,763,699.62/1,422.12
  6. Step 6: Final answer
    x = 1,240.19

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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.