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Finding the Fourth Proportional to 821.79, 1,134.38 and 507.11

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Solution

The fourth proportional to 821.79, 1,134.38 and 507.11 is: 699.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    821.79 : 1,134.38 = 507.11 : x
  2. Step 2: Convert to fraction form
    821.79/1,134.38 = 507.11/x
  3. Step 3: Cross multiply
    821.79x = 1,134.38 × 507.11
  4. Step 4: Simplify right side
    821.79x = 575,247.23
  5. Step 5: Solve for x
    x = 575,247.23/821.79
  6. Step 6: Final answer
    x = 699.99

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Double scale
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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.