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Finding the Fourth Proportional to 811.72, 1,215.30 and 617.52

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Solution

The fourth proportional to 811.72, 1,215.30 and 617.52 is: 924.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    811.72 : 1,215.30 = 617.52 : x
  2. Step 2: Convert to fraction form
    811.72/1,215.30 = 617.52/x
  3. Step 3: Cross multiply
    811.72x = 1,215.30 × 617.52
  4. Step 4: Simplify right side
    811.72x = 750,478.93
  5. Step 5: Solve for x
    x = 750,478.93/811.72
  6. Step 6: Final answer
    x = 924.55

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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.