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Finding the Fourth Proportional to 1,032.80, 1,424.64 and 811.40

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Solution

The fourth proportional to 1,032.80, 1,424.64 and 811.40 is: 1,119.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,032.80 : 1,424.64 = 811.40 : x
  2. Step 2: Convert to fraction form
    1,032.80/1,424.64 = 811.40/x
  3. Step 3: Cross multiply
    1,032.80x = 1,424.64 × 811.40
  4. Step 4: Simplify right side
    1,032.80x = 1,155,952.90
  5. Step 5: Solve for x
    x = 1,155,952.90/1,032.80
  6. Step 6: Final answer
    x = 1,119.24

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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.