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Finding the Fourth Proportional to 386,321.40, 579,482.10 and 137,028.60

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Solution

The fourth proportional to 386,321.40, 579,482.10 and 137,028.60 is: 205,542.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    386,321.40 : 579,482.10 = 137,028.60 : x
  2. Step 2: Convert to fraction form
    386,321.40/579,482.10 = 137,028.60/x
  3. Step 3: Cross multiply
    386,321.40x = 579,482.10 × 137,028.60
  4. Step 4: Simplify right side
    386,321.40x = 79,405,620,888.06
  5. Step 5: Solve for x
    x = 79,405,620,888.06/386,321.40
  6. Step 6: Final answer
    x = 205,542.90

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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.