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Finding the Fourth Proportional to 902.88, 1,355.13 and 440.91

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Solution

The fourth proportional to 902.88, 1,355.13 and 440.91 is: 661.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    902.88 : 1,355.13 = 440.91 : x
  2. Step 2: Convert to fraction form
    902.88/1,355.13 = 440.91/x
  3. Step 3: Cross multiply
    902.88x = 1,355.13 × 440.91
  4. Step 4: Simplify right side
    902.88x = 597,490.37
  5. Step 5: Solve for x
    x = 597,490.37/902.88
  6. Step 6: Final answer
    x = 661.76

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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.