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Finding the Fourth Proportional to 998.53, 1,377.95 and 625.72

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Solution

The fourth proportional to 998.53, 1,377.95 and 625.72 is: 863.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    998.53 : 1,377.95 = 625.72 : x
  2. Step 2: Convert to fraction form
    998.53/1,377.95 = 625.72/x
  3. Step 3: Cross multiply
    998.53x = 1,377.95 × 625.72
  4. Step 4: Simplify right side
    998.53x = 862,200.86
  5. Step 5: Solve for x
    x = 862,200.86/998.53
  6. Step 6: Final answer
    x = 863.47

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.