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Finding the Fourth Proportional to 1,238.08, 1,708.08 and 889.12

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Solution

The fourth proportional to 1,238.08, 1,708.08 and 889.12 is: 1,226.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,238.08 : 1,708.08 = 889.12 : x
  2. Step 2: Convert to fraction form
    1,238.08/1,708.08 = 889.12/x
  3. Step 3: Cross multiply
    1,238.08x = 1,708.08 × 889.12
  4. Step 4: Simplify right side
    1,238.08x = 1,518,688.09
  5. Step 5: Solve for x
    x = 1,518,688.09/1,238.08
  6. Step 6: Final answer
    x = 1,226.65

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.