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Finding the Fourth Proportional to 1,386.10, 1,908.93 and 1,199.80

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Solution

The fourth proportional to 1,386.10, 1,908.93 and 1,199.80 is: 1,652.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,386.10 : 1,908.93 = 1,199.80 : x
  2. Step 2: Convert to fraction form
    1,386.10/1,908.93 = 1,199.80/x
  3. Step 3: Cross multiply
    1,386.10x = 1,908.93 × 1,199.80
  4. Step 4: Simplify right side
    1,386.10x = 2,290,334.21
  5. Step 5: Solve for x
    x = 2,290,334.21/1,386.10
  6. Step 6: Final answer
    x = 1,652.36

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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.