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Finding the Fourth Proportional to 820.83, 1,131.55 and 624

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Solution

The fourth proportional to 820.83, 1,131.55 and 624 is: 860.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    820.83 : 1,131.55 = 624 : x
  2. Step 2: Convert to fraction form
    820.83/1,131.55 = 624/x
  3. Step 3: Cross multiply
    820.83x = 1,131.55 × 624
  4. Step 4: Simplify right side
    820.83x = 706,087.20
  5. Step 5: Solve for x
    x = 706,087.20/820.83
  6. Step 6: Final answer
    x = 860.21

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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.