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Finding the Fourth Proportional to 675.99, 926.78 and 663.68

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Solution

The fourth proportional to 675.99, 926.78 and 663.68 is: 909.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    675.99 : 926.78 = 663.68 : x
  2. Step 2: Convert to fraction form
    675.99/926.78 = 663.68/x
  3. Step 3: Cross multiply
    675.99x = 926.78 × 663.68
  4. Step 4: Simplify right side
    675.99x = 615,085.35
  5. Step 5: Solve for x
    x = 615,085.35/675.99
  6. Step 6: Final answer
    x = 909.90

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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.