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Finding the Fourth Proportional to 282.69, 390.03 and 172.14

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Solution

The fourth proportional to 282.69, 390.03 and 172.14 is: 237.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    282.69 : 390.03 = 172.14 : x
  2. Step 2: Convert to fraction form
    282.69/390.03 = 172.14/x
  3. Step 3: Cross multiply
    282.69x = 390.03 × 172.14
  4. Step 4: Simplify right side
    282.69x = 67,137.66
  5. Step 5: Solve for x
    x = 67,137.66/282.69
  6. Step 6: Final answer
    x = 237.50

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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.