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Finding the Fourth Proportional to 282.68, 390.14 and 172.16

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Solution

The fourth proportional to 282.68, 390.14 and 172.16 is: 237.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    282.68 : 390.14 = 172.16 : x
  2. Step 2: Convert to fraction form
    282.68/390.14 = 172.16/x
  3. Step 3: Cross multiply
    282.68x = 390.14 × 172.16
  4. Step 4: Simplify right side
    282.68x = 67,166.50
  5. Step 5: Solve for x
    x = 67,166.50/282.68
  6. Step 6: Final answer
    x = 237.61

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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.