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Finding the Fourth Proportional to 945.76, 1,418.64 and 261.76

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Solution

The fourth proportional to 945.76, 1,418.64 and 261.76 is: 392.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    945.76 : 1,418.64 = 261.76 : x
  2. Step 2: Convert to fraction form
    945.76/1,418.64 = 261.76/x
  3. Step 3: Cross multiply
    945.76x = 1,418.64 × 261.76
  4. Step 4: Simplify right side
    945.76x = 371,343.21
  5. Step 5: Solve for x
    x = 371,343.21/945.76
  6. Step 6: Final answer
    x = 392.64

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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.