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Finding the Fourth Proportional to 1,555.77, 2,147.40 and 1,380

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Solution

The fourth proportional to 1,555.77, 2,147.40 and 1,380 is: 1,904.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,555.77 : 2,147.40 = 1,380 : x
  2. Step 2: Convert to fraction form
    1,555.77/2,147.40 = 1,380/x
  3. Step 3: Cross multiply
    1,555.77x = 2,147.40 × 1,380
  4. Step 4: Simplify right side
    1,555.77x = 2,963,412
  5. Step 5: Solve for x
    x = 2,963,412/1,555.77
  6. Step 6: Final answer
    x = 1,904.79

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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.