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Finding the Fourth Proportional to 280.40, 386.95 and 156.06

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Solution

The fourth proportional to 280.40, 386.95 and 156.06 is: 215.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    280.40 : 386.95 = 156.06 : x
  2. Step 2: Convert to fraction form
    280.40/386.95 = 156.06/x
  3. Step 3: Cross multiply
    280.40x = 386.95 × 156.06
  4. Step 4: Simplify right side
    280.40x = 60,387.42
  5. Step 5: Solve for x
    x = 60,387.42/280.40
  6. Step 6: Final answer
    x = 215.36

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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.