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Finding the Fourth Proportional to 1,580.53, 2,180.85 and 991.87

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Solution

The fourth proportional to 1,580.53, 2,180.85 and 991.87 is: 1,368.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,580.53 : 2,180.85 = 991.87 : x
  2. Step 2: Convert to fraction form
    1,580.53/2,180.85 = 991.87/x
  3. Step 3: Cross multiply
    1,580.53x = 2,180.85 × 991.87
  4. Step 4: Simplify right side
    1,580.53x = 2,163,119.69
  5. Step 5: Solve for x
    x = 2,163,119.69/1,580.53
  6. Step 6: Final answer
    x = 1,368.60

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.