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Finding the Fourth Proportional to 1,921.02, 2,650.02 and 1,291.70

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Solution

The fourth proportional to 1,921.02, 2,650.02 and 1,291.70 is: 1,781.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,921.02 : 2,650.02 = 1,291.70 : x
  2. Step 2: Convert to fraction form
    1,921.02/2,650.02 = 1,291.70/x
  3. Step 3: Cross multiply
    1,921.02x = 2,650.02 × 1,291.70
  4. Step 4: Simplify right side
    1,921.02x = 3,423,030.83
  5. Step 5: Solve for x
    x = 3,423,030.83/1,921.02
  6. Step 6: Final answer
    x = 1,781.88

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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.