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Finding the Fourth Proportional to 1,991.22, 2,987.58 and 964.50

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Solution

The fourth proportional to 1,991.22, 2,987.58 and 964.50 is: 1,447.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,991.22 : 2,987.58 = 964.50 : x
  2. Step 2: Convert to fraction form
    1,991.22/2,987.58 = 964.50/x
  3. Step 3: Cross multiply
    1,991.22x = 2,987.58 × 964.50
  4. Step 4: Simplify right side
    1,991.22x = 2,881,520.91
  5. Step 5: Solve for x
    x = 2,881,520.91/1,991.22
  6. Step 6: Final answer
    x = 1,447.11

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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.