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Finding the Fourth Proportional to 386,606.80, 579,910.20 and 209,459.80

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Solution

The fourth proportional to 386,606.80, 579,910.20 and 209,459.80 is: 314,189.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    386,606.80 : 579,910.20 = 209,459.80 : x
  2. Step 2: Convert to fraction form
    386,606.80/579,910.20 = 209,459.80/x
  3. Step 3: Cross multiply
    386,606.80x = 579,910.20 × 209,459.80
  4. Step 4: Simplify right side
    386,606.80x = 121,467,874,509.96
  5. Step 5: Solve for x
    x = 121,467,874,509.96/386,606.80
  6. Step 6: Final answer
    x = 314,189.70

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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.