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Finding the Fourth Proportional to 1,008.70, 1,513.28 and 423.37

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Solution

The fourth proportional to 1,008.70, 1,513.28 and 423.37 is: 635.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,008.70 : 1,513.28 = 423.37 : x
  2. Step 2: Convert to fraction form
    1,008.70/1,513.28 = 423.37/x
  3. Step 3: Cross multiply
    1,008.70x = 1,513.28 × 423.37
  4. Step 4: Simplify right side
    1,008.70x = 640,667.67
  5. Step 5: Solve for x
    x = 640,667.67/1,008.70
  6. Step 6: Final answer
    x = 635.15

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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.