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Finding the Fourth Proportional to 280.34, 386.86 and 156.00

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Solution

The fourth proportional to 280.34, 386.86 and 156.00 is: 215.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    280.34 : 386.86 = 156.00 : x
  2. Step 2: Convert to fraction form
    280.34/386.86 = 156.00/x
  3. Step 3: Cross multiply
    280.34x = 386.86 × 156.00
  4. Step 4: Simplify right side
    280.34x = 60,349.78
  5. Step 5: Solve for x
    x = 60,349.78/280.34
  6. Step 6: Final answer
    x = 215.27

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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.