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Finding the Fourth Proportional to 286.79, 430.17 and 70.36

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Solution

The fourth proportional to 286.79, 430.17 and 70.36 is: 105.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    286.79 : 430.17 = 70.36 : x
  2. Step 2: Convert to fraction form
    286.79/430.17 = 70.36/x
  3. Step 3: Cross multiply
    286.79x = 430.17 × 70.36
  4. Step 4: Simplify right side
    286.79x = 30,265.69
  5. Step 5: Solve for x
    x = 30,265.69/286.79
  6. Step 6: Final answer
    x = 105.53

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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.