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Finding the Fourth Proportional to 620,680.80, 931,021.20 and 368,738.40

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Solution

The fourth proportional to 620,680.80, 931,021.20 and 368,738.40 is: 553,107.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    620,680.80 : 931,021.20 = 368,738.40 : x
  2. Step 2: Convert to fraction form
    620,680.80/931,021.20 = 368,738.40/x
  3. Step 3: Cross multiply
    620,680.80x = 931,021.20 × 368,738.40
  4. Step 4: Simplify right side
    620,680.80x = 343,303,267,654.08
  5. Step 5: Solve for x
    x = 343,303,267,654.08/620,680.80
  6. Step 6: Final answer
    x = 553,107.60

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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.