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Finding the Fourth Proportional to 902.76, 1,350.76 and 643.36

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Solution

The fourth proportional to 902.76, 1,350.76 and 643.36 is: 962.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    902.76 : 1,350.76 = 643.36 : x
  2. Step 2: Convert to fraction form
    902.76/1,350.76 = 643.36/x
  3. Step 3: Cross multiply
    902.76x = 1,350.76 × 643.36
  4. Step 4: Simplify right side
    902.76x = 869,024.95
  5. Step 5: Solve for x
    x = 869,024.95/902.76
  6. Step 6: Final answer
    x = 962.63

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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.