Home / 1,140.39-1,572.21-890.73

Finding the Fourth Proportional to 1,140.39, 1,572.21 and 890.73

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Solution

The fourth proportional to 1,140.39, 1,572.21 and 890.73 is: 1,228.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,140.39 : 1,572.21 = 890.73 : x
  2. Step 2: Convert to fraction form
    1,140.39/1,572.21 = 890.73/x
  3. Step 3: Cross multiply
    1,140.39x = 1,572.21 × 890.73
  4. Step 4: Simplify right side
    1,140.39x = 1,400,414.61
  5. Step 5: Solve for x
    x = 1,400,414.61/1,140.39
  6. Step 6: Final answer
    x = 1,228.01

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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.