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Finding the Fourth Proportional to 903.40, 1,353.30 and 491.92

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Solution

The fourth proportional to 903.40, 1,353.30 and 491.92 is: 736.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    903.40 : 1,353.30 = 491.92 : x
  2. Step 2: Convert to fraction form
    903.40/1,353.30 = 491.92/x
  3. Step 3: Cross multiply
    903.40x = 1,353.30 × 491.92
  4. Step 4: Simplify right side
    903.40x = 665,715.34
  5. Step 5: Solve for x
    x = 665,715.34/903.40
  6. Step 6: Final answer
    x = 736.90

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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.