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Finding the Fourth Proportional to 280.46, 386.91 and 187.18

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Solution

The fourth proportional to 280.46, 386.91 and 187.18 is: 258.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    280.46 : 386.91 = 187.18 : x
  2. Step 2: Convert to fraction form
    280.46/386.91 = 187.18/x
  3. Step 3: Cross multiply
    280.46x = 386.91 × 187.18
  4. Step 4: Simplify right side
    280.46x = 72,420.85
  5. Step 5: Solve for x
    x = 72,420.85/280.46
  6. Step 6: Final answer
    x = 258.22

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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.