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Finding the Fourth Proportional to 816.12, 1,225.20 and 653.61

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Solution

The fourth proportional to 816.12, 1,225.20 and 653.61 is: 981.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    816.12 : 1,225.20 = 653.61 : x
  2. Step 2: Convert to fraction form
    816.12/1,225.20 = 653.61/x
  3. Step 3: Cross multiply
    816.12x = 1,225.20 × 653.61
  4. Step 4: Simplify right side
    816.12x = 800,802.97
  5. Step 5: Solve for x
    x = 800,802.97/816.12
  6. Step 6: Final answer
    x = 981.23

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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.