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Finding the Fourth Proportional to 831.02, 1,140.14 and 809.47

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Solution

The fourth proportional to 831.02, 1,140.14 and 809.47 is: 1,110.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    831.02 : 1,140.14 = 809.47 : x
  2. Step 2: Convert to fraction form
    831.02/1,140.14 = 809.47/x
  3. Step 3: Cross multiply
    831.02x = 1,140.14 × 809.47
  4. Step 4: Simplify right side
    831.02x = 922,902.23
  5. Step 5: Solve for x
    x = 922,902.23/831.02
  6. Step 6: Final answer
    x = 1,110.56

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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.