Home / 1,981.45-2,985.79-1,642.39

Finding the Fourth Proportional to 1,981.45, 2,985.79 and 1,642.39

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Solution

The fourth proportional to 1,981.45, 2,985.79 and 1,642.39 is: 2,474.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,981.45 : 2,985.79 = 1,642.39 : x
  2. Step 2: Convert to fraction form
    1,981.45/2,985.79 = 1,642.39/x
  3. Step 3: Cross multiply
    1,981.45x = 2,985.79 × 1,642.39
  4. Step 4: Simplify right side
    1,981.45x = 4,903,831.64
  5. Step 5: Solve for x
    x = 4,903,831.64/1,981.45
  6. Step 6: Final answer
    x = 2,474.87

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.