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Finding the Fourth Proportional to 499,240.72, 689,313 and 308,515.60

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Solution

The fourth proportional to 499,240.72, 689,313 and 308,515.60 is: 425,974.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    499,240.72 : 689,313 = 308,515.60 : x
  2. Step 2: Convert to fraction form
    499,240.72/689,313 = 308,515.60/x
  3. Step 3: Cross multiply
    499,240.72x = 689,313 × 308,515.60
  4. Step 4: Simplify right side
    499,240.72x = 212,663,813,782.80
  5. Step 5: Solve for x
    x = 212,663,813,782.80/499,240.72
  6. Step 6: Final answer
    x = 425,974.50

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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.