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Finding the Fourth Proportional to 356.91, 492.57 and 209.53

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Solution

The fourth proportional to 356.91, 492.57 and 209.53 is: 289.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    356.91 : 492.57 = 209.53 : x
  2. Step 2: Convert to fraction form
    356.91/492.57 = 209.53/x
  3. Step 3: Cross multiply
    356.91x = 492.57 × 209.53
  4. Step 4: Simplify right side
    356.91x = 103,208.81
  5. Step 5: Solve for x
    x = 103,208.81/356.91
  6. Step 6: Final answer
    x = 289.18

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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.