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Finding the Fourth Proportional to 1,273.66, 1,756.56 and 831.40

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Solution

The fourth proportional to 1,273.66, 1,756.56 and 831.40 is: 1,146.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,273.66 : 1,756.56 = 831.40 : x
  2. Step 2: Convert to fraction form
    1,273.66/1,756.56 = 831.40/x
  3. Step 3: Cross multiply
    1,273.66x = 1,756.56 × 831.40
  4. Step 4: Simplify right side
    1,273.66x = 1,460,403.98
  5. Step 5: Solve for x
    x = 1,460,403.98/1,273.66
  6. Step 6: Final answer
    x = 1,146.62

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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.