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Finding the Fourth Proportional to 1,172.57, 1,766.90 and 971.64

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Solution

The fourth proportional to 1,172.57, 1,766.90 and 971.64 is: 1,464.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,172.57 : 1,766.90 = 971.64 : x
  2. Step 2: Convert to fraction form
    1,172.57/1,766.90 = 971.64/x
  3. Step 3: Cross multiply
    1,172.57x = 1,766.90 × 971.64
  4. Step 4: Simplify right side
    1,172.57x = 1,716,785.86
  5. Step 5: Solve for x
    x = 1,716,785.86/1,172.57
  6. Step 6: Final answer
    x = 1,464.13

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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.