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Finding the Fourth Proportional to 699.91, 1,049.32 and 639.70

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Solution

The fourth proportional to 699.91, 1,049.32 and 639.70 is: 959.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    699.91 : 1,049.32 = 639.70 : x
  2. Step 2: Convert to fraction form
    699.91/1,049.32 = 639.70/x
  3. Step 3: Cross multiply
    699.91x = 1,049.32 × 639.70
  4. Step 4: Simplify right side
    699.91x = 671,250.00
  5. Step 5: Solve for x
    x = 671,250.00/699.91
  6. Step 6: Final answer
    x = 959.05

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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.