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Finding the Fourth Proportional to 645.40, 966.48 and 609.76

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Solution

The fourth proportional to 645.40, 966.48 and 609.76 is: 913.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    645.40 : 966.48 = 609.76 : x
  2. Step 2: Convert to fraction form
    645.40/966.48 = 609.76/x
  3. Step 3: Cross multiply
    645.40x = 966.48 × 609.76
  4. Step 4: Simplify right side
    645.40x = 589,320.84
  5. Step 5: Solve for x
    x = 589,320.84/645.40
  6. Step 6: Final answer
    x = 913.11

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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.