Home / 1,989.25-2,981.30-817.93

Finding the Fourth Proportional to 1,989.25, 2,981.30 and 817.93

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Solution

The fourth proportional to 1,989.25, 2,981.30 and 817.93 is: 1,225.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,989.25 : 2,981.30 = 817.93 : x
  2. Step 2: Convert to fraction form
    1,989.25/2,981.30 = 817.93/x
  3. Step 3: Cross multiply
    1,989.25x = 2,981.30 × 817.93
  4. Step 4: Simplify right side
    1,989.25x = 2,438,494.35
  5. Step 5: Solve for x
    x = 2,438,494.35/1,989.25
  6. Step 6: Final answer
    x = 1,225.84

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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.