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Finding the Fourth Proportional to 642.98, 964.28 and 210.18

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Solution

The fourth proportional to 642.98, 964.28 and 210.18 is: 315.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    642.98 : 964.28 = 210.18 : x
  2. Step 2: Convert to fraction form
    642.98/964.28 = 210.18/x
  3. Step 3: Cross multiply
    642.98x = 964.28 × 210.18
  4. Step 4: Simplify right side
    642.98x = 202,672.37
  5. Step 5: Solve for x
    x = 202,672.37/642.98
  6. Step 6: Final answer
    x = 315.21

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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.