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Finding the Fourth Proportional to 821.61, 1,232.55 and 410.33

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Solution

The fourth proportional to 821.61, 1,232.55 and 410.33 is: 615.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    821.61 : 1,232.55 = 410.33 : x
  2. Step 2: Convert to fraction form
    821.61/1,232.55 = 410.33/x
  3. Step 3: Cross multiply
    821.61x = 1,232.55 × 410.33
  4. Step 4: Simplify right side
    821.61x = 505,755.32
  5. Step 5: Solve for x
    x = 505,755.32/821.61
  6. Step 6: Final answer
    x = 615.57

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.