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Finding the Fourth Proportional to 470.40, 649.15 and 260.61

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Solution

The fourth proportional to 470.40, 649.15 and 260.61 is: 359.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    470.40 : 649.15 = 260.61 : x
  2. Step 2: Convert to fraction form
    470.40/649.15 = 260.61/x
  3. Step 3: Cross multiply
    470.40x = 649.15 × 260.61
  4. Step 4: Simplify right side
    470.40x = 169,174.98
  5. Step 5: Solve for x
    x = 169,174.98/470.40
  6. Step 6: Final answer
    x = 359.64

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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.