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Finding the Fourth Proportional to 815.76, 1,224.96 and 569.88

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Solution

The fourth proportional to 815.76, 1,224.96 and 569.88 is: 855.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    815.76 : 1,224.96 = 569.88 : x
  2. Step 2: Convert to fraction form
    815.76/1,224.96 = 569.88/x
  3. Step 3: Cross multiply
    815.76x = 1,224.96 × 569.88
  4. Step 4: Simplify right side
    815.76x = 698,080.20
  5. Step 5: Solve for x
    x = 698,080.20/815.76
  6. Step 6: Final answer
    x = 855.74

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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.