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Finding the Fourth Proportional to 663.19, 909.38 and 640.01

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Solution

The fourth proportional to 663.19, 909.38 and 640.01 is: 877.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    663.19 : 909.38 = 640.01 : x
  2. Step 2: Convert to fraction form
    663.19/909.38 = 640.01/x
  3. Step 3: Cross multiply
    663.19x = 909.38 × 640.01
  4. Step 4: Simplify right side
    663.19x = 582,012.29
  5. Step 5: Solve for x
    x = 582,012.29/663.19
  6. Step 6: Final answer
    x = 877.60

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.