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Finding the Fourth Proportional to 691.17, 948.57 and 619.62

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Solution

The fourth proportional to 691.17, 948.57 and 619.62 is: 850.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    691.17 : 948.57 = 619.62 : x
  2. Step 2: Convert to fraction form
    691.17/948.57 = 619.62/x
  3. Step 3: Cross multiply
    691.17x = 948.57 × 619.62
  4. Step 4: Simplify right side
    691.17x = 587,752.94
  5. Step 5: Solve for x
    x = 587,752.94/691.17
  6. Step 6: Final answer
    x = 850.37

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Double scale
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1.5x scale

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.