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Finding the Fourth Proportional to 688.58, 949.77 and 440.21

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Solution

The fourth proportional to 688.58, 949.77 and 440.21 is: 607.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    688.58 : 949.77 = 440.21 : x
  2. Step 2: Convert to fraction form
    688.58/949.77 = 440.21/x
  3. Step 3: Cross multiply
    688.58x = 949.77 × 440.21
  4. Step 4: Simplify right side
    688.58x = 418,093.50
  5. Step 5: Solve for x
    x = 418,093.50/688.58
  6. Step 6: Final answer
    x = 607.19

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.