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Finding the Fourth Proportional to 213,090.60, 319,635.90 and 209,591.40

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Solution

The fourth proportional to 213,090.60, 319,635.90 and 209,591.40 is: 314,387.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    213,090.60 : 319,635.90 = 209,591.40 : x
  2. Step 2: Convert to fraction form
    213,090.60/319,635.90 = 209,591.40/x
  3. Step 3: Cross multiply
    213,090.60x = 319,635.90 × 209,591.40
  4. Step 4: Simplify right side
    213,090.60x = 66,992,935,771.26
  5. Step 5: Solve for x
    x = 66,992,935,771.26/213,090.60
  6. Step 6: Final answer
    x = 314,387.10

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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.