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Finding the Fourth Proportional to 390,998.80, 585,720.60 and 213,187.60

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Solution

The fourth proportional to 390,998.80, 585,720.60 and 213,187.60 is: 319,357.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,998.80 : 585,720.60 = 213,187.60 : x
  2. Step 2: Convert to fraction form
    390,998.80/585,720.60 = 213,187.60/x
  3. Step 3: Cross multiply
    390,998.80x = 585,720.60 × 213,187.60
  4. Step 4: Simplify right side
    390,998.80x = 124,868,368,984.56
  5. Step 5: Solve for x
    x = 124,868,368,984.56/390,998.80
  6. Step 6: Final answer
    x = 319,357.42

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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.