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Finding the Fourth Proportional to 2,981.36, 4,471.53 and 790.31

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Solution

The fourth proportional to 2,981.36, 4,471.53 and 790.31 is: 1,185.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,981.36 : 4,471.53 = 790.31 : x
  2. Step 2: Convert to fraction form
    2,981.36/4,471.53 = 790.31/x
  3. Step 3: Cross multiply
    2,981.36x = 4,471.53 × 790.31
  4. Step 4: Simplify right side
    2,981.36x = 3,533,894.87
  5. Step 5: Solve for x
    x = 3,533,894.87/2,981.36
  6. Step 6: Final answer
    x = 1,185.33

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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.