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Finding the Fourth Proportional to 280.54, 387.13 and 156.19

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Solution

The fourth proportional to 280.54, 387.13 and 156.19 is: 215.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    280.54 : 387.13 = 156.19 : x
  2. Step 2: Convert to fraction form
    280.54/387.13 = 156.19/x
  3. Step 3: Cross multiply
    280.54x = 387.13 × 156.19
  4. Step 4: Simplify right side
    280.54x = 60,465.83
  5. Step 5: Solve for x
    x = 60,465.83/280.54
  6. Step 6: Final answer
    x = 215.53

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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.