Home / 1,321.20-1,981.57-444.31

Finding the Fourth Proportional to 1,321.20, 1,981.57 and 444.31

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Solution

The fourth proportional to 1,321.20, 1,981.57 and 444.31 is: 666.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,321.20 : 1,981.57 = 444.31 : x
  2. Step 2: Convert to fraction form
    1,321.20/1,981.57 = 444.31/x
  3. Step 3: Cross multiply
    1,321.20x = 1,981.57 × 444.31
  4. Step 4: Simplify right side
    1,321.20x = 880,431.37
  5. Step 5: Solve for x
    x = 880,431.37/1,321.20
  6. Step 6: Final answer
    x = 666.39

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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.