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Finding the Fourth Proportional to 840.52, 1,254.62 and 778.75

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Solution

The fourth proportional to 840.52, 1,254.62 and 778.75 is: 1,162.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    840.52 : 1,254.62 = 778.75 : x
  2. Step 2: Convert to fraction form
    840.52/1,254.62 = 778.75/x
  3. Step 3: Cross multiply
    840.52x = 1,254.62 × 778.75
  4. Step 4: Simplify right side
    840.52x = 977,035.33
  5. Step 5: Solve for x
    x = 977,035.33/840.52
  6. Step 6: Final answer
    x = 1,162.42

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.