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Finding the Fourth Proportional to 1,386.81, 1,914.03 and 862.88

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Solution

The fourth proportional to 1,386.81, 1,914.03 and 862.88 is: 1,190.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,386.81 : 1,914.03 = 862.88 : x
  2. Step 2: Convert to fraction form
    1,386.81/1,914.03 = 862.88/x
  3. Step 3: Cross multiply
    1,386.81x = 1,914.03 × 862.88
  4. Step 4: Simplify right side
    1,386.81x = 1,651,568.64
  5. Step 5: Solve for x
    x = 1,651,568.64/1,386.81
  6. Step 6: Final answer
    x = 1,190.91

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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.