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Finding the Fourth Proportional to 644.77, 966.61 and 259.81

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Solution

The fourth proportional to 644.77, 966.61 and 259.81 is: 389.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    644.77 : 966.61 = 259.81 : x
  2. Step 2: Convert to fraction form
    644.77/966.61 = 259.81/x
  3. Step 3: Cross multiply
    644.77x = 966.61 × 259.81
  4. Step 4: Simplify right side
    644.77x = 251,134.94
  5. Step 5: Solve for x
    x = 251,134.94/644.77
  6. Step 6: Final answer
    x = 389.50

Related Problems

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Double scale
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Similar ratio
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1.5x scale

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.