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Finding the Fourth Proportional to 1,550.72, 2,140.02 and 990.70

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Solution

The fourth proportional to 1,550.72, 2,140.02 and 990.70 is: 1,367.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,550.72 : 2,140.02 = 990.70 : x
  2. Step 2: Convert to fraction form
    1,550.72/2,140.02 = 990.70/x
  3. Step 3: Cross multiply
    1,550.72x = 2,140.02 × 990.70
  4. Step 4: Simplify right side
    1,550.72x = 2,120,117.81
  5. Step 5: Solve for x
    x = 2,120,117.81/1,550.72
  6. Step 6: Final answer
    x = 1,367.18

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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.