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Finding the Fourth Proportional to 1,375.84, 1,898.25 and 778.30

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Solution

The fourth proportional to 1,375.84, 1,898.25 and 778.30 is: 1,073.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,375.84 : 1,898.25 = 778.30 : x
  2. Step 2: Convert to fraction form
    1,375.84/1,898.25 = 778.30/x
  3. Step 3: Cross multiply
    1,375.84x = 1,898.25 × 778.30
  4. Step 4: Simplify right side
    1,375.84x = 1,477,407.98
  5. Step 5: Solve for x
    x = 1,477,407.98/1,375.84
  6. Step 6: Final answer
    x = 1,073.82

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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.