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Finding the Fourth Proportional to 1,078.32, 1,617 and 666.24

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Solution

The fourth proportional to 1,078.32, 1,617 and 666.24 is: 999.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,078.32 : 1,617 = 666.24 : x
  2. Step 2: Convert to fraction form
    1,078.32/1,617 = 666.24/x
  3. Step 3: Cross multiply
    1,078.32x = 1,617 × 666.24
  4. Step 4: Simplify right side
    1,078.32x = 1,077,310.08
  5. Step 5: Solve for x
    x = 1,077,310.08/1,078.32
  6. Step 6: Final answer
    x = 999.06

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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.