Home / 1,550.16-2,138.60-990.50

Finding the Fourth Proportional to 1,550.16, 2,138.60 and 990.50

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Solution

The fourth proportional to 1,550.16, 2,138.60 and 990.50 is: 1,366.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,550.16 : 2,138.60 = 990.50 : x
  2. Step 2: Convert to fraction form
    1,550.16/2,138.60 = 990.50/x
  3. Step 3: Cross multiply
    1,550.16x = 2,138.60 × 990.50
  4. Step 4: Simplify right side
    1,550.16x = 2,118,275.08
  5. Step 5: Solve for x
    x = 2,118,275.08/1,550.16
  6. Step 6: Final answer
    x = 1,366.49

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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.