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Finding the Fourth Proportional to 1,991.25, 2,986.88 and 530.42

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Solution

The fourth proportional to 1,991.25, 2,986.88 and 530.42 is: 795.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,991.25 : 2,986.88 = 530.42 : x
  2. Step 2: Convert to fraction form
    1,991.25/2,986.88 = 530.42/x
  3. Step 3: Cross multiply
    1,991.25x = 2,986.88 × 530.42
  4. Step 4: Simplify right side
    1,991.25x = 1,584,283.30
  5. Step 5: Solve for x
    x = 1,584,283.30/1,991.25
  6. Step 6: Final answer
    x = 795.62

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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.