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Finding the Fourth Proportional to 829.61, 1,144.16 and 642.77

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Solution

The fourth proportional to 829.61, 1,144.16 and 642.77 is: 886.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    829.61 : 1,144.16 = 642.77 : x
  2. Step 2: Convert to fraction form
    829.61/1,144.16 = 642.77/x
  3. Step 3: Cross multiply
    829.61x = 1,144.16 × 642.77
  4. Step 4: Simplify right side
    829.61x = 735,431.72
  5. Step 5: Solve for x
    x = 735,431.72/829.61
  6. Step 6: Final answer
    x = 886.48

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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.