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Finding the Fourth Proportional to 338,412.20, 507,387.90 and 128,018.60

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Solution

The fourth proportional to 338,412.20, 507,387.90 and 128,018.60 is: 191,940.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    338,412.20 : 507,387.90 = 128,018.60 : x
  2. Step 2: Convert to fraction form
    338,412.20/507,387.90 = 128,018.60/x
  3. Step 3: Cross multiply
    338,412.20x = 507,387.90 × 128,018.60
  4. Step 4: Simplify right side
    338,412.20x = 64,955,088,614.94
  5. Step 5: Solve for x
    x = 64,955,088,614.94/338,412.20
  6. Step 6: Final answer
    x = 191,940.74

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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.