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Finding the Fourth Proportional to 661.24, 992.72 and 539.76

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Solution

The fourth proportional to 661.24, 992.72 and 539.76 is: 810.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    661.24 : 992.72 = 539.76 : x
  2. Step 2: Convert to fraction form
    661.24/992.72 = 539.76/x
  3. Step 3: Cross multiply
    661.24x = 992.72 × 539.76
  4. Step 4: Simplify right side
    661.24x = 535,830.55
  5. Step 5: Solve for x
    x = 535,830.55/661.24
  6. Step 6: Final answer
    x = 810.34

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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.