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Finding the Fourth Proportional to 259,720.60, 389,362.20 and 135,061.60

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Solution

The fourth proportional to 259,720.60, 389,362.20 and 135,061.60 is: 202,478.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    259,720.60 : 389,362.20 = 135,061.60 : x
  2. Step 2: Convert to fraction form
    259,720.60/389,362.20 = 135,061.60/x
  3. Step 3: Cross multiply
    259,720.60x = 389,362.20 × 135,061.60
  4. Step 4: Simplify right side
    259,720.60x = 52,587,881,711.52
  5. Step 5: Solve for x
    x = 52,587,881,711.52/259,720.60
  6. Step 6: Final answer
    x = 202,478.67

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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.