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Finding the Fourth Proportional to 661.11, 911.93 and 424.98

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Solution

The fourth proportional to 661.11, 911.93 and 424.98 is: 586.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    661.11 : 911.93 = 424.98 : x
  2. Step 2: Convert to fraction form
    661.11/911.93 = 424.98/x
  3. Step 3: Cross multiply
    661.11x = 911.93 × 424.98
  4. Step 4: Simplify right side
    661.11x = 387,549.73
  5. Step 5: Solve for x
    x = 387,549.73/661.11
  6. Step 6: Final answer
    x = 586.21

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.