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Finding the Fourth Proportional to 651.78, 977.67 and 390.96

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Solution

The fourth proportional to 651.78, 977.67 and 390.96 is: 586.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    651.78 : 977.67 = 390.96 : x
  2. Step 2: Convert to fraction form
    651.78/977.67 = 390.96/x
  3. Step 3: Cross multiply
    651.78x = 977.67 × 390.96
  4. Step 4: Simplify right side
    651.78x = 382,229.86
  5. Step 5: Solve for x
    x = 382,229.86/651.78
  6. Step 6: Final answer
    x = 586.44

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Double scale
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Similar ratio
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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.