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Finding the Fourth Proportional to 3,172.71, 4,759.51 and 981.61

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Solution

The fourth proportional to 3,172.71, 4,759.51 and 981.61 is: 1,472.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,172.71 : 4,759.51 = 981.61 : x
  2. Step 2: Convert to fraction form
    3,172.71/4,759.51 = 981.61/x
  3. Step 3: Cross multiply
    3,172.71x = 4,759.51 × 981.61
  4. Step 4: Simplify right side
    3,172.71x = 4,671,958.81
  5. Step 5: Solve for x
    x = 4,671,958.81/3,172.71
  6. Step 6: Final answer
    x = 1,472.55

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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.