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Finding the Fourth Proportional to 1,378.75, 2,068.20 and 404.95

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Solution

The fourth proportional to 1,378.75, 2,068.20 and 404.95 is: 607.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,378.75 : 2,068.20 = 404.95 : x
  2. Step 2: Convert to fraction form
    1,378.75/2,068.20 = 404.95/x
  3. Step 3: Cross multiply
    1,378.75x = 2,068.20 × 404.95
  4. Step 4: Simplify right side
    1,378.75x = 837,517.59
  5. Step 5: Solve for x
    x = 837,517.59/1,378.75
  6. Step 6: Final answer
    x = 607.45

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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.