Home / 1,321.02-1,981.66-455.40

Finding the Fourth Proportional to 1,321.02, 1,981.66 and 455.40

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Solution

The fourth proportional to 1,321.02, 1,981.66 and 455.40 is: 683.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,321.02 : 1,981.66 = 455.40 : x
  2. Step 2: Convert to fraction form
    1,321.02/1,981.66 = 455.40/x
  3. Step 3: Cross multiply
    1,321.02x = 1,981.66 × 455.40
  4. Step 4: Simplify right side
    1,321.02x = 902,447.96
  5. Step 5: Solve for x
    x = 902,447.96/1,321.02
  6. Step 6: Final answer
    x = 683.14

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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.