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Finding the Fourth Proportional to 920.68, 1,272.42 and 805.48

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Solution

The fourth proportional to 920.68, 1,272.42 and 805.48 is: 1,113.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    920.68 : 1,272.42 = 805.48 : x
  2. Step 2: Convert to fraction form
    920.68/1,272.42 = 805.48/x
  3. Step 3: Cross multiply
    920.68x = 1,272.42 × 805.48
  4. Step 4: Simplify right side
    920.68x = 1,024,908.86
  5. Step 5: Solve for x
    x = 1,024,908.86/920.68
  6. Step 6: Final answer
    x = 1,113.21

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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.