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Finding the Fourth Proportional to 283.18, 390.78 and 172.58

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Solution

The fourth proportional to 283.18, 390.78 and 172.58 is: 238.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    283.18 : 390.78 = 172.58 : x
  2. Step 2: Convert to fraction form
    283.18/390.78 = 172.58/x
  3. Step 3: Cross multiply
    283.18x = 390.78 × 172.58
  4. Step 4: Simplify right side
    283.18x = 67,440.81
  5. Step 5: Solve for x
    x = 67,440.81/283.18
  6. Step 6: Final answer
    x = 238.16

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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.