Home / 1,378.13-1,899.60-1,129.01

Finding the Fourth Proportional to 1,378.13, 1,899.60 and 1,129.01

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Solution

The fourth proportional to 1,378.13, 1,899.60 and 1,129.01 is: 1,556.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,378.13 : 1,899.60 = 1,129.01 : x
  2. Step 2: Convert to fraction form
    1,378.13/1,899.60 = 1,129.01/x
  3. Step 3: Cross multiply
    1,378.13x = 1,899.60 × 1,129.01
  4. Step 4: Simplify right side
    1,378.13x = 2,144,667.40
  5. Step 5: Solve for x
    x = 2,144,667.40/1,378.13
  6. Step 6: Final answer
    x = 1,556.22

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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.