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Finding the Fourth Proportional to 309.78, 462.06 and 263.60

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Solution

The fourth proportional to 309.78, 462.06 and 263.60 is: 393.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    309.78 : 462.06 = 263.60 : x
  2. Step 2: Convert to fraction form
    309.78/462.06 = 263.60/x
  3. Step 3: Cross multiply
    309.78x = 462.06 × 263.60
  4. Step 4: Simplify right side
    309.78x = 121,799.02
  5. Step 5: Solve for x
    x = 121,799.02/309.78
  6. Step 6: Final answer
    x = 393.18

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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.