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Finding the Fourth Proportional to 645.05, 965.95 and 611.03

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Solution

The fourth proportional to 645.05, 965.95 and 611.03 is: 915.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    645.05 : 965.95 = 611.03 : x
  2. Step 2: Convert to fraction form
    645.05/965.95 = 611.03/x
  3. Step 3: Cross multiply
    645.05x = 965.95 × 611.03
  4. Step 4: Simplify right side
    645.05x = 590,224.43
  5. Step 5: Solve for x
    x = 590,224.43/645.05
  6. Step 6: Final answer
    x = 915.01

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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.