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Finding the Fourth Proportional to 679.71, 938.45 and 440.88

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Solution

The fourth proportional to 679.71, 938.45 and 440.88 is: 608.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    679.71 : 938.45 = 440.88 : x
  2. Step 2: Convert to fraction form
    679.71/938.45 = 440.88/x
  3. Step 3: Cross multiply
    679.71x = 938.45 × 440.88
  4. Step 4: Simplify right side
    679.71x = 413,741.63
  5. Step 5: Solve for x
    x = 413,741.63/679.71
  6. Step 6: Final answer
    x = 608.70

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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.