Home / 28,439.85-39,254.04-19,380.21

Finding the Fourth Proportional to 28,439.85, 39,254.04 and 19,380.21

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Solution

The fourth proportional to 28,439.85, 39,254.04 and 19,380.21 is: 26,749.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,439.85 : 39,254.04 = 19,380.21 : x
  2. Step 2: Convert to fraction form
    28,439.85/39,254.04 = 19,380.21/x
  3. Step 3: Cross multiply
    28,439.85x = 39,254.04 × 19,380.21
  4. Step 4: Simplify right side
    28,439.85x = 760,751,538.55
  5. Step 5: Solve for x
    x = 760,751,538.55/28,439.85
  6. Step 6: Final answer
    x = 26,749.49

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.