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Finding the Fourth Proportional to 1,991.61, 2,987.21 and 530.91

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Solution

The fourth proportional to 1,991.61, 2,987.21 and 530.91 is: 796.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,991.61 : 2,987.21 = 530.91 : x
  2. Step 2: Convert to fraction form
    1,991.61/2,987.21 = 530.91/x
  3. Step 3: Cross multiply
    1,991.61x = 2,987.21 × 530.91
  4. Step 4: Simplify right side
    1,991.61x = 1,585,940.99
  5. Step 5: Solve for x
    x = 1,585,940.99/1,991.61
  6. Step 6: Final answer
    x = 796.31

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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.