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Finding the Fourth Proportional to 289,343.20, 434,144.40 and 131,490.40

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Solution

The fourth proportional to 289,343.20, 434,144.40 and 131,490.40 is: 197,294.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    289,343.20 : 434,144.40 = 131,490.40 : x
  2. Step 2: Convert to fraction form
    289,343.20/434,144.40 = 131,490.40/x
  3. Step 3: Cross multiply
    289,343.20x = 434,144.40 × 131,490.40
  4. Step 4: Simplify right side
    289,343.20x = 57,085,820,813.76
  5. Step 5: Solve for x
    x = 57,085,820,813.76/289,343.20
  6. Step 6: Final answer
    x = 197,294.50

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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.