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Finding the Fourth Proportional to 338,971.37, 508,457.05 and 128,609.30

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Solution

The fourth proportional to 338,971.37, 508,457.05 and 128,609.30 is: 192,913.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    338,971.37 : 508,457.05 = 128,609.30 : x
  2. Step 2: Convert to fraction form
    338,971.37/508,457.05 = 128,609.30/x
  3. Step 3: Cross multiply
    338,971.37x = 508,457.05 × 128,609.30
  4. Step 4: Simplify right side
    338,971.37x = 65,392,306,230.18
  5. Step 5: Solve for x
    x = 65,392,306,230.18/338,971.37
  6. Step 6: Final answer
    x = 192,913.95

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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.