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Finding the Fourth Proportional to 690.19, 951.15 and 493.36

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Solution

The fourth proportional to 690.19, 951.15 and 493.36 is: 679.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    690.19 : 951.15 = 493.36 : x
  2. Step 2: Convert to fraction form
    690.19/951.15 = 493.36/x
  3. Step 3: Cross multiply
    690.19x = 951.15 × 493.36
  4. Step 4: Simplify right side
    690.19x = 469,259.36
  5. Step 5: Solve for x
    x = 469,259.36/690.19
  6. Step 6: Final answer
    x = 679.90

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Double scale
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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.