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Finding the Fourth Proportional to 1,991.76, 2,987.92 and 693.06

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Solution

The fourth proportional to 1,991.76, 2,987.92 and 693.06 is: 1,039.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,991.76 : 2,987.92 = 693.06 : x
  2. Step 2: Convert to fraction form
    1,991.76/2,987.92 = 693.06/x
  3. Step 3: Cross multiply
    1,991.76x = 2,987.92 × 693.06
  4. Step 4: Simplify right side
    1,991.76x = 2,070,807.84
  5. Step 5: Solve for x
    x = 2,070,807.84/1,991.76
  6. Step 6: Final answer
    x = 1,039.69

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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.