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Finding the Fourth Proportional to 209,815.20, 314,722.80 and 189,079.20

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Solution

The fourth proportional to 209,815.20, 314,722.80 and 189,079.20 is: 283,618.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    209,815.20 : 314,722.80 = 189,079.20 : x
  2. Step 2: Convert to fraction form
    209,815.20/314,722.80 = 189,079.20/x
  3. Step 3: Cross multiply
    209,815.20x = 314,722.80 × 189,079.20
  4. Step 4: Simplify right side
    209,815.20x = 59,507,535,245.76
  5. Step 5: Solve for x
    x = 59,507,535,245.76/209,815.20
  6. Step 6: Final answer
    x = 283,618.80

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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.