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Finding the Fourth Proportional to 257,709.40, 386,564.10 and 131,738.20

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Solution

The fourth proportional to 257,709.40, 386,564.10 and 131,738.20 is: 197,607.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    257,709.40 : 386,564.10 = 131,738.20 : x
  2. Step 2: Convert to fraction form
    257,709.40/386,564.10 = 131,738.20/x
  3. Step 3: Cross multiply
    257,709.40x = 386,564.10 × 131,738.20
  4. Step 4: Simplify right side
    257,709.40x = 50,925,258,718.62
  5. Step 5: Solve for x
    x = 50,925,258,718.62/257,709.40
  6. Step 6: Final answer
    x = 197,607.30

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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.