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Finding the Fourth Proportional to 922.72, 1,382.88 and 805

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Solution

The fourth proportional to 922.72, 1,382.88 and 805 is: 1,206.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    922.72 : 1,382.88 = 805 : x
  2. Step 2: Convert to fraction form
    922.72/1,382.88 = 805/x
  3. Step 3: Cross multiply
    922.72x = 1,382.88 × 805
  4. Step 4: Simplify right side
    922.72x = 1,113,218.40
  5. Step 5: Solve for x
    x = 1,113,218.40/922.72
  6. Step 6: Final answer
    x = 1,206.45

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.