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Finding the Fourth Proportional to 817.61, 1,224.52 and 655.43

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Solution

The fourth proportional to 817.61, 1,224.52 and 655.43 is: 981.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    817.61 : 1,224.52 = 655.43 : x
  2. Step 2: Convert to fraction form
    817.61/1,224.52 = 655.43/x
  3. Step 3: Cross multiply
    817.61x = 1,224.52 × 655.43
  4. Step 4: Simplify right side
    817.61x = 802,579.38
  5. Step 5: Solve for x
    x = 802,579.38/817.61
  6. Step 6: Final answer
    x = 981.62

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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.