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Finding the Fourth Proportional to 1,260.55, 1,891.13 and 1,239.63

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Solution

The fourth proportional to 1,260.55, 1,891.13 and 1,239.63 is: 1,859.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,260.55 : 1,891.13 = 1,239.63 : x
  2. Step 2: Convert to fraction form
    1,260.55/1,891.13 = 1,239.63/x
  3. Step 3: Cross multiply
    1,260.55x = 1,891.13 × 1,239.63
  4. Step 4: Simplify right side
    1,260.55x = 2,344,301.48
  5. Step 5: Solve for x
    x = 2,344,301.48/1,260.55
  6. Step 6: Final answer
    x = 1,859.74

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1.5x scale

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.