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Finding the Fourth Proportional to 3,618.77, 4,988.45 and 2,831.45

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Solution

The fourth proportional to 3,618.77, 4,988.45 and 2,831.45 is: 3,903.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,618.77 : 4,988.45 = 2,831.45 : x
  2. Step 2: Convert to fraction form
    3,618.77/4,988.45 = 2,831.45/x
  3. Step 3: Cross multiply
    3,618.77x = 4,988.45 × 2,831.45
  4. Step 4: Simplify right side
    3,618.77x = 14,124,546.75
  5. Step 5: Solve for x
    x = 14,124,546.75/3,618.77
  6. Step 6: Final answer
    x = 3,903.13

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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.