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Finding the Fourth Proportional to 231,861.40, 347,792.10 and 212,421.40

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Solution

The fourth proportional to 231,861.40, 347,792.10 and 212,421.40 is: 318,632.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    231,861.40 : 347,792.10 = 212,421.40 : x
  2. Step 2: Convert to fraction form
    231,861.40/347,792.10 = 212,421.40/x
  3. Step 3: Cross multiply
    231,861.40x = 347,792.10 × 212,421.40
  4. Step 4: Simplify right side
    231,861.40x = 73,878,484,790.94
  5. Step 5: Solve for x
    x = 73,878,484,790.94/231,861.40
  6. Step 6: Final answer
    x = 318,632.10

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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.