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Finding the Fourth Proportional to 1,010.99, 1,516.48 and 280.57

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Solution

The fourth proportional to 1,010.99, 1,516.48 and 280.57 is: 420.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,010.99 : 1,516.48 = 280.57 : x
  2. Step 2: Convert to fraction form
    1,010.99/1,516.48 = 280.57/x
  3. Step 3: Cross multiply
    1,010.99x = 1,516.48 × 280.57
  4. Step 4: Simplify right side
    1,010.99x = 425,472.26
  5. Step 5: Solve for x
    x = 425,472.26/1,010.99
  6. Step 6: Final answer
    x = 420.85

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Double scale
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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.