Home / 1,380.17-2,070.38-455.35

Finding the Fourth Proportional to 1,380.17, 2,070.38 and 455.35

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Solution

The fourth proportional to 1,380.17, 2,070.38 and 455.35 is: 683.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,380.17 : 2,070.38 = 455.35 : x
  2. Step 2: Convert to fraction form
    1,380.17/2,070.38 = 455.35/x
  3. Step 3: Cross multiply
    1,380.17x = 2,070.38 × 455.35
  4. Step 4: Simplify right side
    1,380.17x = 942,747.53
  5. Step 5: Solve for x
    x = 942,747.53/1,380.17
  6. Step 6: Final answer
    x = 683.07

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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.