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Finding the Fourth Proportional to 661.10, 991.61 and 276.35

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Solution

The fourth proportional to 661.10, 991.61 and 276.35 is: 414.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    661.10 : 991.61 = 276.35 : x
  2. Step 2: Convert to fraction form
    661.10/991.61 = 276.35/x
  3. Step 3: Cross multiply
    661.10x = 991.61 × 276.35
  4. Step 4: Simplify right side
    661.10x = 274,026.12
  5. Step 5: Solve for x
    x = 274,026.12/661.10
  6. Step 6: Final answer
    x = 414.50

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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.