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Finding the Fourth Proportional to 254,438.40, 381,657.60 and 128,467.20

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Solution

The fourth proportional to 254,438.40, 381,657.60 and 128,467.20 is: 192,700.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    254,438.40 : 381,657.60 = 128,467.20 : x
  2. Step 2: Convert to fraction form
    254,438.40/381,657.60 = 128,467.20/x
  3. Step 3: Cross multiply
    254,438.40x = 381,657.60 × 128,467.20
  4. Step 4: Simplify right side
    254,438.40x = 49,030,483,230.72
  5. Step 5: Solve for x
    x = 49,030,483,230.72/254,438.40
  6. Step 6: Final answer
    x = 192,700.80

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1.5x scale

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.