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Finding the Fourth Proportional to 286.54, 429.65 and 91.50

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Solution

The fourth proportional to 286.54, 429.65 and 91.50 is: 137.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    286.54 : 429.65 = 91.50 : x
  2. Step 2: Convert to fraction form
    286.54/429.65 = 91.50/x
  3. Step 3: Cross multiply
    286.54x = 429.65 × 91.50
  4. Step 4: Simplify right side
    286.54x = 39,313.59
  5. Step 5: Solve for x
    x = 39,313.59/286.54
  6. Step 6: Final answer
    x = 137.20

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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.