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Finding the Fourth Proportional to 259,422.40, 389,085.60 and 72,395.20

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Solution

The fourth proportional to 259,422.40, 389,085.60 and 72,395.20 is: 108,579.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    259,422.40 : 389,085.60 = 72,395.20 : x
  2. Step 2: Convert to fraction form
    259,422.40/389,085.60 = 72,395.20/x
  3. Step 3: Cross multiply
    259,422.40x = 389,085.60 × 72,395.20
  4. Step 4: Simplify right side
    259,422.40x = 28,167,929,829.12
  5. Step 5: Solve for x
    x = 28,167,929,829.12/259,422.40
  6. Step 6: Final answer
    x = 108,579.40

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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.