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Finding the Fourth Proportional to 314.30, 432.78 and 286.94

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Solution

The fourth proportional to 314.30, 432.78 and 286.94 is: 395.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    314.30 : 432.78 = 286.94 : x
  2. Step 2: Convert to fraction form
    314.30/432.78 = 286.94/x
  3. Step 3: Cross multiply
    314.30x = 432.78 × 286.94
  4. Step 4: Simplify right side
    314.30x = 124,181.89
  5. Step 5: Solve for x
    x = 124,181.89/314.30
  6. Step 6: Final answer
    x = 395.11

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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.