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Finding the Fourth Proportional to 690.22, 951.14 and 493.39

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Solution

The fourth proportional to 690.22, 951.14 and 493.39 is: 679.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    690.22 : 951.14 = 493.39 : x
  2. Step 2: Convert to fraction form
    690.22/951.14 = 493.39/x
  3. Step 3: Cross multiply
    690.22x = 951.14 × 493.39
  4. Step 4: Simplify right side
    690.22x = 469,285.39
  5. Step 5: Solve for x
    x = 469,285.39/690.22
  6. Step 6: Final answer
    x = 679.91

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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.