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Finding the Fourth Proportional to 816.59, 1,225.41 and 405.76

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Solution

The fourth proportional to 816.59, 1,225.41 and 405.76 is: 608.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    816.59 : 1,225.41 = 405.76 : x
  2. Step 2: Convert to fraction form
    816.59/1,225.41 = 405.76/x
  3. Step 3: Cross multiply
    816.59x = 1,225.41 × 405.76
  4. Step 4: Simplify right side
    816.59x = 497,222.36
  5. Step 5: Solve for x
    x = 497,222.36/816.59
  6. Step 6: Final answer
    x = 608.90

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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.