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Finding the Fourth Proportional to 1,326.90, 1,990.54 and 461

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Solution

The fourth proportional to 1,326.90, 1,990.54 and 461 is: 691.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,326.90 : 1,990.54 = 461 : x
  2. Step 2: Convert to fraction form
    1,326.90/1,990.54 = 461/x
  3. Step 3: Cross multiply
    1,326.90x = 1,990.54 × 461
  4. Step 4: Simplify right side
    1,326.90x = 917,638.94
  5. Step 5: Solve for x
    x = 917,638.94/1,326.90
  6. Step 6: Final answer
    x = 691.57

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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.