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Finding the Fourth Proportional to 651.87, 977.99 and 261.90

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Solution

The fourth proportional to 651.87, 977.99 and 261.90 is: 392.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    651.87 : 977.99 = 261.90 : x
  2. Step 2: Convert to fraction form
    651.87/977.99 = 261.90/x
  3. Step 3: Cross multiply
    651.87x = 977.99 × 261.90
  4. Step 4: Simplify right side
    651.87x = 256,134.27
  5. Step 5: Solve for x
    x = 256,134.27/651.87
  6. Step 6: Final answer
    x = 392.92

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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.