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Finding the Fourth Proportional to 865.98, 1,299.05 and 280.99

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Solution

The fourth proportional to 865.98, 1,299.05 and 280.99 is: 421.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    865.98 : 1,299.05 = 280.99 : x
  2. Step 2: Convert to fraction form
    865.98/1,299.05 = 280.99/x
  3. Step 3: Cross multiply
    865.98x = 1,299.05 × 280.99
  4. Step 4: Simplify right side
    865.98x = 365,020.06
  5. Step 5: Solve for x
    x = 365,020.06/865.98
  6. Step 6: Final answer
    x = 421.51

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Double scale
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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.