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Finding the Fourth Proportional to 2,175.64, 3,263.86 and 715.21

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Solution

The fourth proportional to 2,175.64, 3,263.86 and 715.21 is: 1,072.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,175.64 : 3,263.86 = 715.21 : x
  2. Step 2: Convert to fraction form
    2,175.64/3,263.86 = 715.21/x
  3. Step 3: Cross multiply
    2,175.64x = 3,263.86 × 715.21
  4. Step 4: Simplify right side
    2,175.64x = 2,334,345.31
  5. Step 5: Solve for x
    x = 2,334,345.31/2,175.64
  6. Step 6: Final answer
    x = 1,072.95

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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.