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Finding the Fourth Proportional to 3,280.66, 4,920.15 and 971.62

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Solution

The fourth proportional to 3,280.66, 4,920.15 and 971.62 is: 1,457.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,280.66 : 4,920.15 = 971.62 : x
  2. Step 2: Convert to fraction form
    3,280.66/4,920.15 = 971.62/x
  3. Step 3: Cross multiply
    3,280.66x = 4,920.15 × 971.62
  4. Step 4: Simplify right side
    3,280.66x = 4,780,516.14
  5. Step 5: Solve for x
    x = 4,780,516.14/3,280.66
  6. Step 6: Final answer
    x = 1,457.18

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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.