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Finding the Fourth Proportional to 816.79, 1,225.19 and 574.40

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Solution

The fourth proportional to 816.79, 1,225.19 and 574.40 is: 861.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    816.79 : 1,225.19 = 574.40 : x
  2. Step 2: Convert to fraction form
    816.79/1,225.19 = 574.40/x
  3. Step 3: Cross multiply
    816.79x = 1,225.19 × 574.40
  4. Step 4: Simplify right side
    816.79x = 703,749.14
  5. Step 5: Solve for x
    x = 703,749.14/816.79
  6. Step 6: Final answer
    x = 861.60

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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.