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Finding the Fourth Proportional to 1,990.95, 2,981.88 and 951.69

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Solution

The fourth proportional to 1,990.95, 2,981.88 and 951.69 is: 1,425.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,990.95 : 2,981.88 = 951.69 : x
  2. Step 2: Convert to fraction form
    1,990.95/2,981.88 = 951.69/x
  3. Step 3: Cross multiply
    1,990.95x = 2,981.88 × 951.69
  4. Step 4: Simplify right side
    1,990.95x = 2,837,825.38
  5. Step 5: Solve for x
    x = 2,837,825.38/1,990.95
  6. Step 6: Final answer
    x = 1,425.36

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.