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Finding the Fourth Proportional to 831.27, 1,147.38 and 569.23

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Solution

The fourth proportional to 831.27, 1,147.38 and 569.23 is: 785.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    831.27 : 1,147.38 = 569.23 : x
  2. Step 2: Convert to fraction form
    831.27/1,147.38 = 569.23/x
  3. Step 3: Cross multiply
    831.27x = 1,147.38 × 569.23
  4. Step 4: Simplify right side
    831.27x = 653,123.12
  5. Step 5: Solve for x
    x = 653,123.12/831.27
  6. Step 6: Final answer
    x = 785.69

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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.