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Finding the Fourth Proportional to 903.84, 1,244.04 and 641.40

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Solution

The fourth proportional to 903.84, 1,244.04 and 641.40 is: 882.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    903.84 : 1,244.04 = 641.40 : x
  2. Step 2: Convert to fraction form
    903.84/1,244.04 = 641.40/x
  3. Step 3: Cross multiply
    903.84x = 1,244.04 × 641.40
  4. Step 4: Simplify right side
    903.84x = 797,927.26
  5. Step 5: Solve for x
    x = 797,927.26/903.84
  6. Step 6: Final answer
    x = 882.82

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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.