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Finding the Fourth Proportional to 1,008.81, 1,513.25 and 278.39

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Solution

The fourth proportional to 1,008.81, 1,513.25 and 278.39 is: 417.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,008.81 : 1,513.25 = 278.39 : x
  2. Step 2: Convert to fraction form
    1,008.81/1,513.25 = 278.39/x
  3. Step 3: Cross multiply
    1,008.81x = 1,513.25 × 278.39
  4. Step 4: Simplify right side
    1,008.81x = 421,264.71
  5. Step 5: Solve for x
    x = 421,264.71/1,008.81
  6. Step 6: Final answer
    x = 417.59

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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.