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Finding the Fourth Proportional to 1,010.78, 1,516.12 and 280.34

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Solution

The fourth proportional to 1,010.78, 1,516.12 and 280.34 is: 420.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,010.78 : 1,516.12 = 280.34 : x
  2. Step 2: Convert to fraction form
    1,010.78/1,516.12 = 280.34/x
  3. Step 3: Cross multiply
    1,010.78x = 1,516.12 × 280.34
  4. Step 4: Simplify right side
    1,010.78x = 425,021.50
  5. Step 5: Solve for x
    x = 425,021.50/1,010.78
  6. Step 6: Final answer
    x = 420.49

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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.