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Finding the Fourth Proportional to 831.08, 1,146.48 and 720.38

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Solution

The fourth proportional to 831.08, 1,146.48 and 720.38 is: 993.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    831.08 : 1,146.48 = 720.38 : x
  2. Step 2: Convert to fraction form
    831.08/1,146.48 = 720.38/x
  3. Step 3: Cross multiply
    831.08x = 1,146.48 × 720.38
  4. Step 4: Simplify right side
    831.08x = 825,901.26
  5. Step 5: Solve for x
    x = 825,901.26/831.08
  6. Step 6: Final answer
    x = 993.77

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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.