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Finding the Fourth Proportional to 838.88, 1,155.29 and 820.71

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Solution

The fourth proportional to 838.88, 1,155.29 and 820.71 is: 1,130.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    838.88 : 1,155.29 = 820.71 : x
  2. Step 2: Convert to fraction form
    838.88/1,155.29 = 820.71/x
  3. Step 3: Cross multiply
    838.88x = 1,155.29 × 820.71
  4. Step 4: Simplify right side
    838.88x = 948,153.95
  5. Step 5: Solve for x
    x = 948,153.95/838.88
  6. Step 6: Final answer
    x = 1,130.27

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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.