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Finding the Fourth Proportional to 920.80, 1,272 and 816.04

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Solution

The fourth proportional to 920.80, 1,272 and 816.04 is: 1,127.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    920.80 : 1,272 = 816.04 : x
  2. Step 2: Convert to fraction form
    920.80/1,272 = 816.04/x
  3. Step 3: Cross multiply
    920.80x = 1,272 × 816.04
  4. Step 4: Simplify right side
    920.80x = 1,038,002.88
  5. Step 5: Solve for x
    x = 1,038,002.88/920.80
  6. Step 6: Final answer
    x = 1,127.28

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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.