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Finding the Fourth Proportional to 340.59, 470.16 and 209.78

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Solution

The fourth proportional to 340.59, 470.16 and 209.78 is: 289.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    340.59 : 470.16 = 209.78 : x
  2. Step 2: Convert to fraction form
    340.59/470.16 = 209.78/x
  3. Step 3: Cross multiply
    340.59x = 470.16 × 209.78
  4. Step 4: Simplify right side
    340.59x = 98,627.81
  5. Step 5: Solve for x
    x = 98,627.81/340.59
  6. Step 6: Final answer
    x = 289.58

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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.