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Finding the Fourth Proportional to 209.58, 314.40 and 65.31

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Solution

The fourth proportional to 209.58, 314.40 and 65.31 is: 97.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    209.58 : 314.40 = 65.31 : x
  2. Step 2: Convert to fraction form
    209.58/314.40 = 65.31/x
  3. Step 3: Cross multiply
    209.58x = 314.40 × 65.31
  4. Step 4: Simplify right side
    209.58x = 20,534.49
  5. Step 5: Solve for x
    x = 20,534.49/209.58
  6. Step 6: Final answer
    x = 97.98

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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.