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Finding the Fourth Proportional to 357.12, 492.80 and 209.72

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Solution

The fourth proportional to 357.12, 492.80 and 209.72 is: 289.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    357.12 : 492.80 = 209.72 : x
  2. Step 2: Convert to fraction form
    357.12/492.80 = 209.72/x
  3. Step 3: Cross multiply
    357.12x = 492.80 × 209.72
  4. Step 4: Simplify right side
    357.12x = 103,350.02
  5. Step 5: Solve for x
    x = 103,350.02/357.12
  6. Step 6: Final answer
    x = 289.40

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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.