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Finding the Fourth Proportional to 1,297.62, 1,955.54 and 1,215.61

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Solution

The fourth proportional to 1,297.62, 1,955.54 and 1,215.61 is: 1,831.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,297.62 : 1,955.54 = 1,215.61 : x
  2. Step 2: Convert to fraction form
    1,297.62/1,955.54 = 1,215.61/x
  3. Step 3: Cross multiply
    1,297.62x = 1,955.54 × 1,215.61
  4. Step 4: Simplify right side
    1,297.62x = 2,377,172.13
  5. Step 5: Solve for x
    x = 2,377,172.13/1,297.62
  6. Step 6: Final answer
    x = 1,831.95

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.