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Finding the Fourth Proportional to 1,376.61, 2,064.78 and 451.95

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Solution

The fourth proportional to 1,376.61, 2,064.78 and 451.95 is: 677.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,376.61 : 2,064.78 = 451.95 : x
  2. Step 2: Convert to fraction form
    1,376.61/2,064.78 = 451.95/x
  3. Step 3: Cross multiply
    1,376.61x = 2,064.78 × 451.95
  4. Step 4: Simplify right side
    1,376.61x = 933,177.32
  5. Step 5: Solve for x
    x = 933,177.32/1,376.61
  6. Step 6: Final answer
    x = 677.88

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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.