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Finding the Fourth Proportional to 279.83, 386.14 and 155.50

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Solution

The fourth proportional to 279.83, 386.14 and 155.50 is: 214.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    279.83 : 386.14 = 155.50 : x
  2. Step 2: Convert to fraction form
    279.83/386.14 = 155.50/x
  3. Step 3: Cross multiply
    279.83x = 386.14 × 155.50
  4. Step 4: Simplify right side
    279.83x = 60,044.77
  5. Step 5: Solve for x
    x = 60,044.77/279.83
  6. Step 6: Final answer
    x = 214.58

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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.