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Finding the Fourth Proportional to 1,448.66, 2,172.99 and 831.44

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Solution

The fourth proportional to 1,448.66, 2,172.99 and 831.44 is: 1,247.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,448.66 : 2,172.99 = 831.44 : x
  2. Step 2: Convert to fraction form
    1,448.66/2,172.99 = 831.44/x
  3. Step 3: Cross multiply
    1,448.66x = 2,172.99 × 831.44
  4. Step 4: Simplify right side
    1,448.66x = 1,806,710.81
  5. Step 5: Solve for x
    x = 1,806,710.81/1,448.66
  6. Step 6: Final answer
    x = 1,247.16

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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.