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Finding the Fourth Proportional to 470.79, 649.78 and 284.31

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Solution

The fourth proportional to 470.79, 649.78 and 284.31 is: 392.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    470.79 : 649.78 = 284.31 : x
  2. Step 2: Convert to fraction form
    470.79/649.78 = 284.31/x
  3. Step 3: Cross multiply
    470.79x = 649.78 × 284.31
  4. Step 4: Simplify right side
    470.79x = 184,734.28
  5. Step 5: Solve for x
    x = 184,734.28/470.79
  6. Step 6: Final answer
    x = 392.40

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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.