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Finding the Fourth Proportional to 1,887.99, 2,604.70 and 1,391.81

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Solution

The fourth proportional to 1,887.99, 2,604.70 and 1,391.81 is: 1,920.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,887.99 : 2,604.70 = 1,391.81 : x
  2. Step 2: Convert to fraction form
    1,887.99/2,604.70 = 1,391.81/x
  3. Step 3: Cross multiply
    1,887.99x = 2,604.70 × 1,391.81
  4. Step 4: Simplify right side
    1,887.99x = 3,625,247.51
  5. Step 5: Solve for x
    x = 3,625,247.51/1,887.99
  6. Step 6: Final answer
    x = 1,920.16

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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.