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Finding the Fourth Proportional to 842.61, 1,162.47 and 621.48

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Solution

The fourth proportional to 842.61, 1,162.47 and 621.48 is: 857.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    842.61 : 1,162.47 = 621.48 : x
  2. Step 2: Convert to fraction form
    842.61/1,162.47 = 621.48/x
  3. Step 3: Cross multiply
    842.61x = 1,162.47 × 621.48
  4. Step 4: Simplify right side
    842.61x = 722,451.86
  5. Step 5: Solve for x
    x = 722,451.86/842.61
  6. Step 6: Final answer
    x = 857.40

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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.