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Finding the Fourth Proportional to 671.88, 927.50 and 642.51

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Solution

The fourth proportional to 671.88, 927.50 and 642.51 is: 886.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    671.88 : 927.50 = 642.51 : x
  2. Step 2: Convert to fraction form
    671.88/927.50 = 642.51/x
  3. Step 3: Cross multiply
    671.88x = 927.50 × 642.51
  4. Step 4: Simplify right side
    671.88x = 595,924.81
  5. Step 5: Solve for x
    x = 595,924.81/671.88
  6. Step 6: Final answer
    x = 886.95

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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.