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Finding the Fourth Proportional to 1,106.39, 1,658.30 and 831.60

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Solution

The fourth proportional to 1,106.39, 1,658.30 and 831.60 is: 1,246.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,106.39 : 1,658.30 = 831.60 : x
  2. Step 2: Convert to fraction form
    1,106.39/1,658.30 = 831.60/x
  3. Step 3: Cross multiply
    1,106.39x = 1,658.30 × 831.60
  4. Step 4: Simplify right side
    1,106.39x = 1,379,038.12
  5. Step 5: Solve for x
    x = 1,379,038.12/1,106.39
  6. Step 6: Final answer
    x = 1,246.43

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.