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Finding the Fourth Proportional to 338,512.68, 507,685.50 and 138,889.80

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Solution

The fourth proportional to 338,512.68, 507,685.50 and 138,889.80 is: 208,300.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    338,512.68 : 507,685.50 = 138,889.80 : x
  2. Step 2: Convert to fraction form
    338,512.68/507,685.50 = 138,889.80/x
  3. Step 3: Cross multiply
    338,512.68x = 507,685.50 × 138,889.80
  4. Step 4: Simplify right side
    338,512.68x = 70,512,337,557.90
  5. Step 5: Solve for x
    x = 70,512,337,557.90/338,512.68
  6. Step 6: Final answer
    x = 208,300.43

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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.