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Finding the Fourth Proportional to 1,777.64, 2,453.06 and 991.66

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Solution

The fourth proportional to 1,777.64, 2,453.06 and 991.66 is: 1,368.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,777.64 : 2,453.06 = 991.66 : x
  2. Step 2: Convert to fraction form
    1,777.64/2,453.06 = 991.66/x
  3. Step 3: Cross multiply
    1,777.64x = 2,453.06 × 991.66
  4. Step 4: Simplify right side
    1,777.64x = 2,432,601.48
  5. Step 5: Solve for x
    x = 2,432,601.48/1,777.64
  6. Step 6: Final answer
    x = 1,368.44

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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.