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Finding the Fourth Proportional to 1,991.17, 2,987.19 and 604.61

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Solution

The fourth proportional to 1,991.17, 2,987.19 and 604.61 is: 907.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,991.17 : 2,987.19 = 604.61 : x
  2. Step 2: Convert to fraction form
    1,991.17/2,987.19 = 604.61/x
  3. Step 3: Cross multiply
    1,991.17x = 2,987.19 × 604.61
  4. Step 4: Simplify right side
    1,991.17x = 1,806,096.31
  5. Step 5: Solve for x
    x = 1,806,096.31/1,991.17
  6. Step 6: Final answer
    x = 907.05

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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.