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Finding the Fourth Proportional to 286.99, 430.48 and 70.57

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Solution

The fourth proportional to 286.99, 430.48 and 70.57 is: 105.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    286.99 : 430.48 = 70.57 : x
  2. Step 2: Convert to fraction form
    286.99/430.48 = 70.57/x
  3. Step 3: Cross multiply
    286.99x = 430.48 × 70.57
  4. Step 4: Simplify right side
    286.99x = 30,376.82
  5. Step 5: Solve for x
    x = 30,376.82/286.99
  6. Step 6: Final answer
    x = 105.85

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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.