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Finding the Fourth Proportional to 903.14, 1,244.55 and 640.70

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Solution

The fourth proportional to 903.14, 1,244.55 and 640.70 is: 882.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    903.14 : 1,244.55 = 640.70 : x
  2. Step 2: Convert to fraction form
    903.14/1,244.55 = 640.70/x
  3. Step 3: Cross multiply
    903.14x = 1,244.55 × 640.70
  4. Step 4: Simplify right side
    903.14x = 797,383.19
  5. Step 5: Solve for x
    x = 797,383.19/903.14
  6. Step 6: Final answer
    x = 882.90

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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.