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Finding the Fourth Proportional to 1,393.61, 2,092.47 and 778.52

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Solution

The fourth proportional to 1,393.61, 2,092.47 and 778.52 is: 1,168.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,393.61 : 2,092.47 = 778.52 : x
  2. Step 2: Convert to fraction form
    1,393.61/2,092.47 = 778.52/x
  3. Step 3: Cross multiply
    1,393.61x = 2,092.47 × 778.52
  4. Step 4: Simplify right side
    1,393.61x = 1,629,029.74
  5. Step 5: Solve for x
    x = 1,629,029.74/1,393.61
  6. Step 6: Final answer
    x = 1,168.93

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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.