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Finding the Fourth Proportional to 1,260.70, 1,890.78 and 602.20

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Solution

The fourth proportional to 1,260.70, 1,890.78 and 602.20 is: 903.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,260.70 : 1,890.78 = 602.20 : x
  2. Step 2: Convert to fraction form
    1,260.70/1,890.78 = 602.20/x
  3. Step 3: Cross multiply
    1,260.70x = 1,890.78 × 602.20
  4. Step 4: Simplify right side
    1,260.70x = 1,138,627.72
  5. Step 5: Solve for x
    x = 1,138,627.72/1,260.70
  6. Step 6: Final answer
    x = 903.17

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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.