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Finding the Fourth Proportional to 898.43, 1,349.69 and 639.05

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Solution

The fourth proportional to 898.43, 1,349.69 and 639.05 is: 960.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    898.43 : 1,349.69 = 639.05 : x
  2. Step 2: Convert to fraction form
    898.43/1,349.69 = 639.05/x
  3. Step 3: Cross multiply
    898.43x = 1,349.69 × 639.05
  4. Step 4: Simplify right side
    898.43x = 862,509.45
  5. Step 5: Solve for x
    x = 862,509.45/898.43
  6. Step 6: Final answer
    x = 960.02

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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.