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Finding the Fourth Proportional to 1,013.35, 1,398.43 and 640.49

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Solution

The fourth proportional to 1,013.35, 1,398.43 and 640.49 is: 883.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,013.35 : 1,398.43 = 640.49 : x
  2. Step 2: Convert to fraction form
    1,013.35/1,398.43 = 640.49/x
  3. Step 3: Cross multiply
    1,013.35x = 1,398.43 × 640.49
  4. Step 4: Simplify right side
    1,013.35x = 895,683.75
  5. Step 5: Solve for x
    x = 895,683.75/1,013.35
  6. Step 6: Final answer
    x = 883.89

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.