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Finding the Fourth Proportional to 651.35, 977.71 and 391.99

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Solution

The fourth proportional to 651.35, 977.71 and 391.99 is: 588.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    651.35 : 977.71 = 391.99 : x
  2. Step 2: Convert to fraction form
    651.35/977.71 = 391.99/x
  3. Step 3: Cross multiply
    651.35x = 977.71 × 391.99
  4. Step 4: Simplify right side
    651.35x = 383,247.65
  5. Step 5: Solve for x
    x = 383,247.65/651.35
  6. Step 6: Final answer
    x = 588.39

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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.