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Finding the Fourth Proportional to 651.12, 977.08 and 261.08

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Solution

The fourth proportional to 651.12, 977.08 and 261.08 is: 391.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    651.12 : 977.08 = 261.08 : x
  2. Step 2: Convert to fraction form
    651.12/977.08 = 261.08/x
  3. Step 3: Cross multiply
    651.12x = 977.08 × 261.08
  4. Step 4: Simplify right side
    651.12x = 255,096.82
  5. Step 5: Solve for x
    x = 255,096.82/651.12
  6. Step 6: Final answer
    x = 391.78

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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.