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Finding the Fourth Proportional to 816.40, 1,222.80 and 571.60

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Solution

The fourth proportional to 816.40, 1,222.80 and 571.60 is: 856.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    816.40 : 1,222.80 = 571.60 : x
  2. Step 2: Convert to fraction form
    816.40/1,222.80 = 571.60/x
  3. Step 3: Cross multiply
    816.40x = 1,222.80 × 571.60
  4. Step 4: Simplify right side
    816.40x = 698,952.48
  5. Step 5: Solve for x
    x = 698,952.48/816.40
  6. Step 6: Final answer
    x = 856.14

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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.