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Finding the Fourth Proportional to 651.40, 977.06 and 261.20

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Solution

The fourth proportional to 651.40, 977.06 and 261.20 is: 391.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    651.40 : 977.06 = 261.20 : x
  2. Step 2: Convert to fraction form
    651.40/977.06 = 261.20/x
  3. Step 3: Cross multiply
    651.40x = 977.06 × 261.20
  4. Step 4: Simplify right side
    651.40x = 255,208.07
  5. Step 5: Solve for x
    x = 255,208.07/651.40
  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.