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Finding the Fourth Proportional to 280.19, 386.67 and 155.86

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Solution

The fourth proportional to 280.19, 386.67 and 155.86 is: 215.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    280.19 : 386.67 = 155.86 : x
  2. Step 2: Convert to fraction form
    280.19/386.67 = 155.86/x
  3. Step 3: Cross multiply
    280.19x = 386.67 × 155.86
  4. Step 4: Simplify right side
    280.19x = 60,264.45
  5. Step 5: Solve for x
    x = 60,264.45/280.19
  6. Step 6: Final answer
    x = 215.08

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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.