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Finding the Fourth Proportional to 645.15, 965.40 and 559.50

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Solution

The fourth proportional to 645.15, 965.40 and 559.50 is: 837.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    645.15 : 965.40 = 559.50 : x
  2. Step 2: Convert to fraction form
    645.15/965.40 = 559.50/x
  3. Step 3: Cross multiply
    645.15x = 965.40 × 559.50
  4. Step 4: Simplify right side
    645.15x = 540,141.30
  5. Step 5: Solve for x
    x = 540,141.30/645.15
  6. Step 6: Final answer
    x = 837.23

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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.