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Finding the Fourth Proportional to 842, 1,162.08 and 805.10

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Solution

The fourth proportional to 842, 1,162.08 and 805.10 is: 1,111.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    842 : 1,162.08 = 805.10 : x
  2. Step 2: Convert to fraction form
    842/1,162.08 = 805.10/x
  3. Step 3: Cross multiply
    842x = 1,162.08 × 805.10
  4. Step 4: Simplify right side
    842x = 935,590.61
  5. Step 5: Solve for x
    x = 935,590.61/842
  6. Step 6: Final answer
    x = 1,111.15

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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.