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Finding the Fourth Proportional to 1,259.92, 1,889.56 and 490

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Solution

The fourth proportional to 1,259.92, 1,889.56 and 490 is: 734.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,259.92 : 1,889.56 = 490 : x
  2. Step 2: Convert to fraction form
    1,259.92/1,889.56 = 490/x
  3. Step 3: Cross multiply
    1,259.92x = 1,889.56 × 490
  4. Step 4: Simplify right side
    1,259.92x = 925,884.40
  5. Step 5: Solve for x
    x = 925,884.40/1,259.92
  6. Step 6: Final answer
    x = 734.88

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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.