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Finding the Fourth Proportional to 470.48, 705.21 and 287.99

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Solution

The fourth proportional to 470.48, 705.21 and 287.99 is: 431.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    470.48 : 705.21 = 287.99 : x
  2. Step 2: Convert to fraction form
    470.48/705.21 = 287.99/x
  3. Step 3: Cross multiply
    470.48x = 705.21 × 287.99
  4. Step 4: Simplify right side
    470.48x = 203,091.47
  5. Step 5: Solve for x
    x = 203,091.47/470.48
  6. Step 6: Final answer
    x = 431.67

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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.