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Finding the Fourth Proportional to 823.19, 1,135.81 and 491.74

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Solution

The fourth proportional to 823.19, 1,135.81 and 491.74 is: 678.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    823.19 : 1,135.81 = 491.74 : x
  2. Step 2: Convert to fraction form
    823.19/1,135.81 = 491.74/x
  3. Step 3: Cross multiply
    823.19x = 1,135.81 × 491.74
  4. Step 4: Simplify right side
    823.19x = 558,523.21
  5. Step 5: Solve for x
    x = 558,523.21/823.19
  6. Step 6: Final answer
    x = 678.49

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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.