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Finding the Fourth Proportional to 259,428.40, 389,094.60 and 72,401.20

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Solution

The fourth proportional to 259,428.40, 389,094.60 and 72,401.20 is: 108,588.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    259,428.40 : 389,094.60 = 72,401.20 : x
  2. Step 2: Convert to fraction form
    259,428.40/389,094.60 = 72,401.20/x
  3. Step 3: Cross multiply
    259,428.40x = 389,094.60 × 72,401.20
  4. Step 4: Simplify right side
    259,428.40x = 28,170,915,953.52
  5. Step 5: Solve for x
    x = 28,170,915,953.52/259,428.40
  6. Step 6: Final answer
    x = 108,588.40

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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.