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Finding the Fourth Proportional to 901.02, 1,349.19 and 639.63

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Solution

The fourth proportional to 901.02, 1,349.19 and 639.63 is: 957.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    901.02 : 1,349.19 = 639.63 : x
  2. Step 2: Convert to fraction form
    901.02/1,349.19 = 639.63/x
  3. Step 3: Cross multiply
    901.02x = 1,349.19 × 639.63
  4. Step 4: Simplify right side
    901.02x = 862,982.40
  5. Step 5: Solve for x
    x = 862,982.40/901.02
  6. Step 6: Final answer
    x = 957.78

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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.