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Finding the Fourth Proportional to 816.69, 1,126.19 and 630.21

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Solution

The fourth proportional to 816.69, 1,126.19 and 630.21 is: 869.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    816.69 : 1,126.19 = 630.21 : x
  2. Step 2: Convert to fraction form
    816.69/1,126.19 = 630.21/x
  3. Step 3: Cross multiply
    816.69x = 1,126.19 × 630.21
  4. Step 4: Simplify right side
    816.69x = 709,733.05
  5. Step 5: Solve for x
    x = 709,733.05/816.69
  6. Step 6: Final answer
    x = 869.04

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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.