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Finding the Fourth Proportional to 651.33, 977.87 and 640.39

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Solution

The fourth proportional to 651.33, 977.87 and 640.39 is: 961.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    651.33 : 977.87 = 640.39 : x
  2. Step 2: Convert to fraction form
    651.33/977.87 = 640.39/x
  3. Step 3: Cross multiply
    651.33x = 977.87 × 640.39
  4. Step 4: Simplify right side
    651.33x = 626,218.17
  5. Step 5: Solve for x
    x = 626,218.17/651.33
  6. Step 6: Final answer
    x = 961.45

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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.