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Finding the Fourth Proportional to 470.71, 705.51 and 287.69

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Solution

The fourth proportional to 470.71, 705.51 and 287.69 is: 431.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    470.71 : 705.51 = 287.69 : x
  2. Step 2: Convert to fraction form
    470.71/705.51 = 287.69/x
  3. Step 3: Cross multiply
    470.71x = 705.51 × 287.69
  4. Step 4: Simplify right side
    470.71x = 202,964.64
  5. Step 5: Solve for x
    x = 202,964.64/470.71
  6. Step 6: Final answer
    x = 431.19

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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.