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Finding the Fourth Proportional to 1,434.90, 2,149.82 and 1,021.90

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Solution

The fourth proportional to 1,434.90, 2,149.82 and 1,021.90 is: 1,531.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,434.90 : 2,149.82 = 1,021.90 : x
  2. Step 2: Convert to fraction form
    1,434.90/2,149.82 = 1,021.90/x
  3. Step 3: Cross multiply
    1,434.90x = 2,149.82 × 1,021.90
  4. Step 4: Simplify right side
    1,434.90x = 2,196,901.06
  5. Step 5: Solve for x
    x = 2,196,901.06/1,434.90
  6. Step 6: Final answer
    x = 1,531.05

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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.