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Finding the Fourth Proportional to 470.40, 706.20 and 287.34

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Solution

The fourth proportional to 470.40, 706.20 and 287.34 is: 431.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    470.40 : 706.20 = 287.34 : x
  2. Step 2: Convert to fraction form
    470.40/706.20 = 287.34/x
  3. Step 3: Cross multiply
    470.40x = 706.20 × 287.34
  4. Step 4: Simplify right side
    470.40x = 202,919.51
  5. Step 5: Solve for x
    x = 202,919.51/470.40
  6. Step 6: Final answer
    x = 431.38

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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.