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Finding the Fourth Proportional to 289,638.40, 434,457.60 and 210,380.80

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Solution

The fourth proportional to 289,638.40, 434,457.60 and 210,380.80 is: 315,571.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    289,638.40 : 434,457.60 = 210,380.80 : x
  2. Step 2: Convert to fraction form
    289,638.40/434,457.60 = 210,380.80/x
  3. Step 3: Cross multiply
    289,638.40x = 434,457.60 × 210,380.80
  4. Step 4: Simplify right side
    289,638.40x = 91,401,537,454.08
  5. Step 5: Solve for x
    x = 91,401,537,454.08/289,638.40
  6. Step 6: Final answer
    x = 315,571.20

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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.