Home / 1,380.07-2,069.65-455.40

Finding the Fourth Proportional to 1,380.07, 2,069.65 and 455.40

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Solution

The fourth proportional to 1,380.07, 2,069.65 and 455.40 is: 682.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,380.07 : 2,069.65 = 455.40 : x
  2. Step 2: Convert to fraction form
    1,380.07/2,069.65 = 455.40/x
  3. Step 3: Cross multiply
    1,380.07x = 2,069.65 × 455.40
  4. Step 4: Simplify right side
    1,380.07x = 942,518.61
  5. Step 5: Solve for x
    x = 942,518.61/1,380.07
  6. Step 6: Final answer
    x = 682.95

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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.