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Finding the Fourth Proportional to 1,390.18, 1,919.14 and 866.38

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Solution

The fourth proportional to 1,390.18, 1,919.14 and 866.38 is: 1,196.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,390.18 : 1,919.14 = 866.38 : x
  2. Step 2: Convert to fraction form
    1,390.18/1,919.14 = 866.38/x
  3. Step 3: Cross multiply
    1,390.18x = 1,919.14 × 866.38
  4. Step 4: Simplify right side
    1,390.18x = 1,662,704.51
  5. Step 5: Solve for x
    x = 1,662,704.51/1,390.18
  6. Step 6: Final answer
    x = 1,196.04

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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.