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Finding the Fourth Proportional to 644.59, 966.89 and 259.75

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Solution

The fourth proportional to 644.59, 966.89 and 259.75 is: 389.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    644.59 : 966.89 = 259.75 : x
  2. Step 2: Convert to fraction form
    644.59/966.89 = 259.75/x
  3. Step 3: Cross multiply
    644.59x = 966.89 × 259.75
  4. Step 4: Simplify right side
    644.59x = 251,148.38
  5. Step 5: Solve for x
    x = 251,148.38/644.59
  6. Step 6: Final answer
    x = 389.63

Related Problems

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Half scale
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Double scale
Find fourth proportional to 645.59, 968.39 and 260.75
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.