Home / 1,550.15-2,139.19-920.99

Finding the Fourth Proportional to 1,550.15, 2,139.19 and 920.99

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Solution

The fourth proportional to 1,550.15, 2,139.19 and 920.99 is: 1,270.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,550.15 : 2,139.19 = 920.99 : x
  2. Step 2: Convert to fraction form
    1,550.15/2,139.19 = 920.99/x
  3. Step 3: Cross multiply
    1,550.15x = 2,139.19 × 920.99
  4. Step 4: Simplify right side
    1,550.15x = 1,970,159.60
  5. Step 5: Solve for x
    x = 1,970,159.60/1,550.15
  6. Step 6: Final answer
    x = 1,270.95

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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.