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Finding the Fourth Proportional to 817.40, 1,225.08 and 355.40

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Solution

The fourth proportional to 817.40, 1,225.08 and 355.40 is: 532.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    817.40 : 1,225.08 = 355.40 : x
  2. Step 2: Convert to fraction form
    817.40/1,225.08 = 355.40/x
  3. Step 3: Cross multiply
    817.40x = 1,225.08 × 355.40
  4. Step 4: Simplify right side
    817.40x = 435,393.43
  5. Step 5: Solve for x
    x = 435,393.43/817.40
  6. Step 6: Final answer
    x = 532.66

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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.