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Finding the Fourth Proportional to 810.40, 1,215.48 and 371.52

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Solution

The fourth proportional to 810.40, 1,215.48 and 371.52 is: 557.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    810.40 : 1,215.48 = 371.52 : x
  2. Step 2: Convert to fraction form
    810.40/1,215.48 = 371.52/x
  3. Step 3: Cross multiply
    810.40x = 1,215.48 × 371.52
  4. Step 4: Simplify right side
    810.40x = 451,575.13
  5. Step 5: Solve for x
    x = 451,575.13/810.40
  6. Step 6: Final answer
    x = 557.22

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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.