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Finding the Fourth Proportional to 1,991.43, 2,987.52 and 657.30

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Solution

The fourth proportional to 1,991.43, 2,987.52 and 657.30 is: 986.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,991.43 : 2,987.52 = 657.30 : x
  2. Step 2: Convert to fraction form
    1,991.43/2,987.52 = 657.30/x
  3. Step 3: Cross multiply
    1,991.43x = 2,987.52 × 657.30
  4. Step 4: Simplify right side
    1,991.43x = 1,963,693.61
  5. Step 5: Solve for x
    x = 1,963,693.61/1,991.43
  6. Step 6: Final answer
    x = 986.07

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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.