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Finding the Fourth Proportional to 820.84, 1,131.72 and 525.61

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Solution

The fourth proportional to 820.84, 1,131.72 and 525.61 is: 724.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    820.84 : 1,131.72 = 525.61 : x
  2. Step 2: Convert to fraction form
    820.84/1,131.72 = 525.61/x
  3. Step 3: Cross multiply
    820.84x = 1,131.72 × 525.61
  4. Step 4: Simplify right side
    820.84x = 594,843.35
  5. Step 5: Solve for x
    x = 594,843.35/820.84
  6. Step 6: Final answer
    x = 724.68

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1.5x scale

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.