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Finding the Fourth Proportional to 470.34, 705.78 and 307.80

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Solution

The fourth proportional to 470.34, 705.78 and 307.80 is: 461.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    470.34 : 705.78 = 307.80 : x
  2. Step 2: Convert to fraction form
    470.34/705.78 = 307.80/x
  3. Step 3: Cross multiply
    470.34x = 705.78 × 307.80
  4. Step 4: Simplify right side
    470.34x = 217,239.08
  5. Step 5: Solve for x
    x = 217,239.08/470.34
  6. Step 6: Final answer
    x = 461.88

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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.