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Finding the Fourth Proportional to 1,110.52, 1,529.82 and 778.30

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Solution

The fourth proportional to 1,110.52, 1,529.82 and 778.30 is: 1,072.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,110.52 : 1,529.82 = 778.30 : x
  2. Step 2: Convert to fraction form
    1,110.52/1,529.82 = 778.30/x
  3. Step 3: Cross multiply
    1,110.52x = 1,529.82 × 778.30
  4. Step 4: Simplify right side
    1,110.52x = 1,190,658.91
  5. Step 5: Solve for x
    x = 1,190,658.91/1,110.52
  6. Step 6: Final answer
    x = 1,072.16

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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.