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Finding the Fourth Proportional to 716.63, 986.51 and 642.92

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Solution

The fourth proportional to 716.63, 986.51 and 642.92 is: 885.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    716.63 : 986.51 = 642.92 : x
  2. Step 2: Convert to fraction form
    716.63/986.51 = 642.92/x
  3. Step 3: Cross multiply
    716.63x = 986.51 × 642.92
  4. Step 4: Simplify right side
    716.63x = 634,243.68
  5. Step 5: Solve for x
    x = 634,243.68/716.63
  6. Step 6: Final answer
    x = 885.04

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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.