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Finding the Fourth Proportional to 209.16, 288.30 and 156.72

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Solution

The fourth proportional to 209.16, 288.30 and 156.72 is: 216.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    209.16 : 288.30 = 156.72 : x
  2. Step 2: Convert to fraction form
    209.16/288.30 = 156.72/x
  3. Step 3: Cross multiply
    209.16x = 288.30 × 156.72
  4. Step 4: Simplify right side
    209.16x = 45,182.38
  5. Step 5: Solve for x
    x = 45,182.38/209.16
  6. Step 6: Final answer
    x = 216.02

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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.