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Finding the Fourth Proportional to 771.24, 1,154.42 and 553.76

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Solution

The fourth proportional to 771.24, 1,154.42 and 553.76 is: 828.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    771.24 : 1,154.42 = 553.76 : x
  2. Step 2: Convert to fraction form
    771.24/1,154.42 = 553.76/x
  3. Step 3: Cross multiply
    771.24x = 1,154.42 × 553.76
  4. Step 4: Simplify right side
    771.24x = 639,271.62
  5. Step 5: Solve for x
    x = 639,271.62/771.24
  6. Step 6: Final answer
    x = 828.89

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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.