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Finding the Fourth Proportional to 817.30, 1,223.88 and 655.30

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Solution

The fourth proportional to 817.30, 1,223.88 and 655.30 is: 981.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    817.30 : 1,223.88 = 655.30 : x
  2. Step 2: Convert to fraction form
    817.30/1,223.88 = 655.30/x
  3. Step 3: Cross multiply
    817.30x = 1,223.88 × 655.30
  4. Step 4: Simplify right side
    817.30x = 802,008.56
  5. Step 5: Solve for x
    x = 802,008.56/817.30
  6. Step 6: Final answer
    x = 981.29

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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.