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Finding the Fourth Proportional to 810.53, 1,215.94 and 561.41

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Solution

The fourth proportional to 810.53, 1,215.94 and 561.41 is: 842.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    810.53 : 1,215.94 = 561.41 : x
  2. Step 2: Convert to fraction form
    810.53/1,215.94 = 561.41/x
  3. Step 3: Cross multiply
    810.53x = 1,215.94 × 561.41
  4. Step 4: Simplify right side
    810.53x = 682,645.32
  5. Step 5: Solve for x
    x = 682,645.32/810.53
  6. Step 6: Final answer
    x = 842.22

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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.