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Finding the Fourth Proportional to 470.79, 649.66 and 258.09

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Solution

The fourth proportional to 470.79, 649.66 and 258.09 is: 356.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    470.79 : 649.66 = 258.09 : x
  2. Step 2: Convert to fraction form
    470.79/649.66 = 258.09/x
  3. Step 3: Cross multiply
    470.79x = 649.66 × 258.09
  4. Step 4: Simplify right side
    470.79x = 167,670.75
  5. Step 5: Solve for x
    x = 167,670.75/470.79
  6. Step 6: Final answer
    x = 356.15

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.