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Finding the Fourth Proportional to 1,326.88, 1,990.61 and 402.51

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Solution

The fourth proportional to 1,326.88, 1,990.61 and 402.51 is: 603.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,326.88 : 1,990.61 = 402.51 : x
  2. Step 2: Convert to fraction form
    1,326.88/1,990.61 = 402.51/x
  3. Step 3: Cross multiply
    1,326.88x = 1,990.61 × 402.51
  4. Step 4: Simplify right side
    1,326.88x = 801,244.06
  5. Step 5: Solve for x
    x = 801,244.06/1,326.88
  6. Step 6: Final answer
    x = 603.85

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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.