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Finding the Fourth Proportional to 282.59, 390 and 172.13

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Solution

The fourth proportional to 282.59, 390 and 172.13 is: 237.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    282.59 : 390 = 172.13 : x
  2. Step 2: Convert to fraction form
    282.59/390 = 172.13/x
  3. Step 3: Cross multiply
    282.59x = 390 × 172.13
  4. Step 4: Simplify right side
    282.59x = 67,130.70
  5. Step 5: Solve for x
    x = 67,130.70/282.59
  6. Step 6: Final answer
    x = 237.56

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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.