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Finding the Fourth Proportional to 1,390.46, 1,920.39 and 1,094.81

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Solution

The fourth proportional to 1,390.46, 1,920.39 and 1,094.81 is: 1,512.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,390.46 : 1,920.39 = 1,094.81 : x
  2. Step 2: Convert to fraction form
    1,390.46/1,920.39 = 1,094.81/x
  3. Step 3: Cross multiply
    1,390.46x = 1,920.39 × 1,094.81
  4. Step 4: Simplify right side
    1,390.46x = 2,102,462.18
  5. Step 5: Solve for x
    x = 2,102,462.18/1,390.46
  6. Step 6: Final answer
    x = 1,512.06

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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.