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Finding the Fourth Proportional to 386,389.36, 579,620.80 and 120,078.16

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Solution

The fourth proportional to 386,389.36, 579,620.80 and 120,078.16 is: 180,128.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    386,389.36 : 579,620.80 = 120,078.16 : x
  2. Step 2: Convert to fraction form
    386,389.36/579,620.80 = 120,078.16/x
  3. Step 3: Cross multiply
    386,389.36x = 579,620.80 × 120,078.16
  4. Step 4: Simplify right side
    386,389.36x = 69,599,799,161.73
  5. Step 5: Solve for x
    x = 69,599,799,161.73/386,389.36
  6. Step 6: Final answer
    x = 180,128.66

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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.