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Finding the Fourth Proportional to 620,740.80, 931,111.20 and 221,394.60

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Solution

The fourth proportional to 620,740.80, 931,111.20 and 221,394.60 is: 332,091.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    620,740.80 : 931,111.20 = 221,394.60 : x
  2. Step 2: Convert to fraction form
    620,740.80/931,111.20 = 221,394.60/x
  3. Step 3: Cross multiply
    620,740.80x = 931,111.20 × 221,394.60
  4. Step 4: Simplify right side
    620,740.80x = 206,142,991,679.52
  5. Step 5: Solve for x
    x = 206,142,991,679.52/620,740.80
  6. Step 6: Final answer
    x = 332,091.90

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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.