Home / 1,981.73-2,970.46-1,288.90

Finding the Fourth Proportional to 1,981.73, 2,970.46 and 1,288.90

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Solution

The fourth proportional to 1,981.73, 2,970.46 and 1,288.90 is: 1,931.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,981.73 : 2,970.46 = 1,288.90 : x
  2. Step 2: Convert to fraction form
    1,981.73/2,970.46 = 1,288.90/x
  3. Step 3: Cross multiply
    1,981.73x = 2,970.46 × 1,288.90
  4. Step 4: Simplify right side
    1,981.73x = 3,828,615.74
  5. Step 5: Solve for x
    x = 3,828,615.74/1,981.73
  6. Step 6: Final answer
    x = 1,931.95

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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.