Home / 1,380.15-2,070.23-406.23

Finding the Fourth Proportional to 1,380.15, 2,070.23 and 406.23

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Solution

The fourth proportional to 1,380.15, 2,070.23 and 406.23 is: 609.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,380.15 : 2,070.23 = 406.23 : x
  2. Step 2: Convert to fraction form
    1,380.15/2,070.23 = 406.23/x
  3. Step 3: Cross multiply
    1,380.15x = 2,070.23 × 406.23
  4. Step 4: Simplify right side
    1,380.15x = 840,987.50
  5. Step 5: Solve for x
    x = 840,987.50/1,380.15
  6. Step 6: Final answer
    x = 609.35

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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.