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Finding the Fourth Proportional to 311,640.75, 429,990.98 and 189,130.41

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Solution

The fourth proportional to 311,640.75, 429,990.98 and 189,130.41 is: 260,955.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    311,640.75 : 429,990.98 = 189,130.41 : x
  2. Step 2: Convert to fraction form
    311,640.75/429,990.98 = 189,130.41/x
  3. Step 3: Cross multiply
    311,640.75x = 429,990.98 × 189,130.41
  4. Step 4: Simplify right side
    311,640.75x = 81,324,369,752.67
  5. Step 5: Solve for x
    x = 81,324,369,752.67/311,640.75
  6. Step 6: Final answer
    x = 260,955.51

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.