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Finding the Fourth Proportional to 239.34, 328.78 and 210.18

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Solution

The fourth proportional to 239.34, 328.78 and 210.18 is: 288.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    239.34 : 328.78 = 210.18 : x
  2. Step 2: Convert to fraction form
    239.34/328.78 = 210.18/x
  3. Step 3: Cross multiply
    239.34x = 328.78 × 210.18
  4. Step 4: Simplify right side
    239.34x = 69,102.98
  5. Step 5: Solve for x
    x = 69,102.98/239.34
  6. Step 6: Final answer
    x = 288.72

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.