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Finding the Fourth Proportional to 500,915.49, 691,334.27 and 309,990.39

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Solution

The fourth proportional to 500,915.49, 691,334.27 and 309,990.39 is: 427,830.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    500,915.49 : 691,334.27 = 309,990.39 : x
  2. Step 2: Convert to fraction form
    500,915.49/691,334.27 = 309,990.39/x
  3. Step 3: Cross multiply
    500,915.49x = 691,334.27 × 309,990.39
  4. Step 4: Simplify right side
    500,915.49x = 214,306,979,977.67
  5. Step 5: Solve for x
    x = 214,306,979,977.67/500,915.49
  6. Step 6: Final answer
    x = 427,830.61

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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.