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Finding the Fourth Proportional to 385.65, 532.17 and 210.99

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Solution

The fourth proportional to 385.65, 532.17 and 210.99 is: 291.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    385.65 : 532.17 = 210.99 : x
  2. Step 2: Convert to fraction form
    385.65/532.17 = 210.99/x
  3. Step 3: Cross multiply
    385.65x = 532.17 × 210.99
  4. Step 4: Simplify right side
    385.65x = 112,282.55
  5. Step 5: Solve for x
    x = 112,282.55/385.65
  6. Step 6: Final answer
    x = 291.15

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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.