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Finding the Fourth Proportional to 279.47, 385.65 and 155.12

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Solution

The fourth proportional to 279.47, 385.65 and 155.12 is: 214.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    279.47 : 385.65 = 155.12 : x
  2. Step 2: Convert to fraction form
    279.47/385.65 = 155.12/x
  3. Step 3: Cross multiply
    279.47x = 385.65 × 155.12
  4. Step 4: Simplify right side
    279.47x = 59,823.79
  5. Step 5: Solve for x
    x = 59,823.79/279.47
  6. Step 6: Final answer
    x = 214.06

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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.