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Finding the Fourth Proportional to 651.78, 977.67 and 261.90

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Solution

The fourth proportional to 651.78, 977.67 and 261.90 is: 392.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    651.78 : 977.67 = 261.90 : x
  2. Step 2: Convert to fraction form
    651.78/977.67 = 261.90/x
  3. Step 3: Cross multiply
    651.78x = 977.67 × 261.90
  4. Step 4: Simplify right side
    651.78x = 256,051.77
  5. Step 5: Solve for x
    x = 256,051.77/651.78
  6. Step 6: Final answer
    x = 392.85

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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.