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Finding the Fourth Proportional to 289,419.80, 434,129.70 and 89,738.60

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Solution

The fourth proportional to 289,419.80, 434,129.70 and 89,738.60 is: 134,607.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    289,419.80 : 434,129.70 = 89,738.60 : x
  2. Step 2: Convert to fraction form
    289,419.80/434,129.70 = 89,738.60/x
  3. Step 3: Cross multiply
    289,419.80x = 434,129.70 × 89,738.60
  4. Step 4: Simplify right side
    289,419.80x = 38,958,191,496.42
  5. Step 5: Solve for x
    x = 38,958,191,496.42/289,419.80
  6. Step 6: Final answer
    x = 134,607.90

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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.