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Finding the Fourth Proportional to 3,172.61, 4,758.91 and 981.29

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Solution

The fourth proportional to 3,172.61, 4,758.91 and 981.29 is: 1,471.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,172.61 : 4,758.91 = 981.29 : x
  2. Step 2: Convert to fraction form
    3,172.61/4,758.91 = 981.29/x
  3. Step 3: Cross multiply
    3,172.61x = 4,758.91 × 981.29
  4. Step 4: Simplify right side
    3,172.61x = 4,669,842.09
  5. Step 5: Solve for x
    x = 4,669,842.09/3,172.61
  6. Step 6: Final answer
    x = 1,471.93

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1.5x scale

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.