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Finding the Fourth Proportional to 1,223.94, 1,688.26 and 831.64

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Solution

The fourth proportional to 1,223.94, 1,688.26 and 831.64 is: 1,147.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,223.94 : 1,688.26 = 831.64 : x
  2. Step 2: Convert to fraction form
    1,223.94/1,688.26 = 831.64/x
  3. Step 3: Cross multiply
    1,223.94x = 1,688.26 × 831.64
  4. Step 4: Simplify right side
    1,223.94x = 1,404,024.55
  5. Step 5: Solve for x
    x = 1,404,024.55/1,223.94
  6. Step 6: Final answer
    x = 1,147.14

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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.