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Finding the Fourth Proportional to 491.28, 736.61 and 209.51

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Solution

The fourth proportional to 491.28, 736.61 and 209.51 is: 314.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    491.28 : 736.61 = 209.51 : x
  2. Step 2: Convert to fraction form
    491.28/736.61 = 209.51/x
  3. Step 3: Cross multiply
    491.28x = 736.61 × 209.51
  4. Step 4: Simplify right side
    491.28x = 154,326.11
  5. Step 5: Solve for x
    x = 154,326.11/491.28
  6. Step 6: Final answer
    x = 314.13

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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.