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Finding the Fourth Proportional to 1,320.80, 1,823.35 and 823.71

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Solution

The fourth proportional to 1,320.80, 1,823.35 and 823.71 is: 1,137.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,320.80 : 1,823.35 = 823.71 : x
  2. Step 2: Convert to fraction form
    1,320.80/1,823.35 = 823.71/x
  3. Step 3: Cross multiply
    1,320.80x = 1,823.35 × 823.71
  4. Step 4: Simplify right side
    1,320.80x = 1,501,920.72
  5. Step 5: Solve for x
    x = 1,501,920.72/1,320.80
  6. Step 6: Final answer
    x = 1,137.13

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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.