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Finding the Fourth Proportional to 1,039.55, 1,436.40 and 831.44

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Solution

The fourth proportional to 1,039.55, 1,436.40 and 831.44 is: 1,148.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,039.55 : 1,436.40 = 831.44 : x
  2. Step 2: Convert to fraction form
    1,039.55/1,436.40 = 831.44/x
  3. Step 3: Cross multiply
    1,039.55x = 1,436.40 × 831.44
  4. Step 4: Simplify right side
    1,039.55x = 1,194,280.42
  5. Step 5: Solve for x
    x = 1,194,280.42/1,039.55
  6. Step 6: Final answer
    x = 1,148.84

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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.