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Finding the Fourth Proportional to 1,008.91, 1,513.37 and 278.52

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Solution

The fourth proportional to 1,008.91, 1,513.37 and 278.52 is: 417.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,008.91 : 1,513.37 = 278.52 : x
  2. Step 2: Convert to fraction form
    1,008.91/1,513.37 = 278.52/x
  3. Step 3: Cross multiply
    1,008.91x = 1,513.37 × 278.52
  4. Step 4: Simplify right side
    1,008.91x = 421,503.81
  5. Step 5: Solve for x
    x = 421,503.81/1,008.91
  6. Step 6: Final answer
    x = 417.78

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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.