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Finding the Fourth Proportional to 779.78, 1,076.10 and 425.70

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Solution

The fourth proportional to 779.78, 1,076.10 and 425.70 is: 587.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    779.78 : 1,076.10 = 425.70 : x
  2. Step 2: Convert to fraction form
    779.78/1,076.10 = 425.70/x
  3. Step 3: Cross multiply
    779.78x = 1,076.10 × 425.70
  4. Step 4: Simplify right side
    779.78x = 458,101.40
  5. Step 5: Solve for x
    x = 458,101.40/779.78
  6. Step 6: Final answer
    x = 587.48

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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.