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Finding the Fourth Proportional to 651.64, 977.22 and 212.79

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Solution

The fourth proportional to 651.64, 977.22 and 212.79 is: 319.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    651.64 : 977.22 = 212.79 : x
  2. Step 2: Convert to fraction form
    651.64/977.22 = 212.79/x
  3. Step 3: Cross multiply
    651.64x = 977.22 × 212.79
  4. Step 4: Simplify right side
    651.64x = 207,939.14
  5. Step 5: Solve for x
    x = 207,939.14/651.64
  6. Step 6: Final answer
    x = 319.10

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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.