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Finding the Fourth Proportional to 840.78, 1,260.97 and 565.79

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Solution

The fourth proportional to 840.78, 1,260.97 and 565.79 is: 848.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    840.78 : 1,260.97 = 565.79 : x
  2. Step 2: Convert to fraction form
    840.78/1,260.97 = 565.79/x
  3. Step 3: Cross multiply
    840.78x = 1,260.97 × 565.79
  4. Step 4: Simplify right side
    840.78x = 713,436.50
  5. Step 5: Solve for x
    x = 713,436.50/840.78
  6. Step 6: Final answer
    x = 848.54

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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.