Home / 1,390.26-1,920.56-1,110.13

Finding the Fourth Proportional to 1,390.26, 1,920.56 and 1,110.13

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Solution

The fourth proportional to 1,390.26, 1,920.56 and 1,110.13 is: 1,533.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,390.26 : 1,920.56 = 1,110.13 : x
  2. Step 2: Convert to fraction form
    1,390.26/1,920.56 = 1,110.13/x
  3. Step 3: Cross multiply
    1,390.26x = 1,920.56 × 1,110.13
  4. Step 4: Simplify right side
    1,390.26x = 2,132,065.08
  5. Step 5: Solve for x
    x = 2,132,065.08/1,390.26
  6. Step 6: Final answer
    x = 1,533.57

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1.5x scale

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.