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Finding the Fourth Proportional to 821.64, 1,131.04 and 624.52

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Solution

The fourth proportional to 821.64, 1,131.04 and 624.52 is: 859.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    821.64 : 1,131.04 = 624.52 : x
  2. Step 2: Convert to fraction form
    821.64/1,131.04 = 624.52/x
  3. Step 3: Cross multiply
    821.64x = 1,131.04 × 624.52
  4. Step 4: Simplify right side
    821.64x = 706,357.10
  5. Step 5: Solve for x
    x = 706,357.10/821.64
  6. Step 6: Final answer
    x = 859.69

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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.