Home / 1,390.35-1,914.78-1,360.11

Finding the Fourth Proportional to 1,390.35, 1,914.78 and 1,360.11

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Solution

The fourth proportional to 1,390.35, 1,914.78 and 1,360.11 is: 1,873.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,390.35 : 1,914.78 = 1,360.11 : x
  2. Step 2: Convert to fraction form
    1,390.35/1,914.78 = 1,360.11/x
  3. Step 3: Cross multiply
    1,390.35x = 1,914.78 × 1,360.11
  4. Step 4: Simplify right side
    1,390.35x = 2,604,311.43
  5. Step 5: Solve for x
    x = 2,604,311.43/1,390.35
  6. Step 6: Final answer
    x = 1,873.13

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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.