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Finding the Fourth Proportional to 828.01, 1,242.37 and 280.25

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Solution

The fourth proportional to 828.01, 1,242.37 and 280.25 is: 420.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    828.01 : 1,242.37 = 280.25 : x
  2. Step 2: Convert to fraction form
    828.01/1,242.37 = 280.25/x
  3. Step 3: Cross multiply
    828.01x = 1,242.37 × 280.25
  4. Step 4: Simplify right side
    828.01x = 348,174.19
  5. Step 5: Solve for x
    x = 348,174.19/828.01
  6. Step 6: Final answer
    x = 420.50

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.