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Finding the Fourth Proportional to 1,360, 1,880 and 1,238.56

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Solution

The fourth proportional to 1,360, 1,880 and 1,238.56 is: 1,712.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,360 : 1,880 = 1,238.56 : x
  2. Step 2: Convert to fraction form
    1,360/1,880 = 1,238.56/x
  3. Step 3: Cross multiply
    1,360x = 1,880 × 1,238.56
  4. Step 4: Simplify right side
    1,360x = 2,328,492.80
  5. Step 5: Solve for x
    x = 2,328,492.80/1,360
  6. Step 6: Final answer
    x = 1,712.13

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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.