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Finding the Fourth Proportional to 283.19, 390.79 and 158.86

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Solution

The fourth proportional to 283.19, 390.79 and 158.86 is: 219.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    283.19 : 390.79 = 158.86 : x
  2. Step 2: Convert to fraction form
    283.19/390.79 = 158.86/x
  3. Step 3: Cross multiply
    283.19x = 390.79 × 158.86
  4. Step 4: Simplify right side
    283.19x = 62,080.90
  5. Step 5: Solve for x
    x = 62,080.90/283.19
  6. Step 6: Final answer
    x = 219.22

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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.