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Finding the Fourth Proportional to 922.95, 1,273.41 and 642.87

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Solution

The fourth proportional to 922.95, 1,273.41 and 642.87 is: 886.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    922.95 : 1,273.41 = 642.87 : x
  2. Step 2: Convert to fraction form
    922.95/1,273.41 = 642.87/x
  3. Step 3: Cross multiply
    922.95x = 1,273.41 × 642.87
  4. Step 4: Simplify right side
    922.95x = 818,637.09
  5. Step 5: Solve for x
    x = 818,637.09/922.95
  6. Step 6: Final answer
    x = 886.98

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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.