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Finding the Fourth Proportional to 1,238, 1,857.32 and 468.72

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Solution

The fourth proportional to 1,238, 1,857.32 and 468.72 is: 703.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,238 : 1,857.32 = 468.72 : x
  2. Step 2: Convert to fraction form
    1,238/1,857.32 = 468.72/x
  3. Step 3: Cross multiply
    1,238x = 1,857.32 × 468.72
  4. Step 4: Simplify right side
    1,238x = 870,563.03
  5. Step 5: Solve for x
    x = 870,563.03/1,238
  6. Step 6: Final answer
    x = 703.20

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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.