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Finding the Fourth Proportional to 620,661.40, 930,992.10 and 221,315.20

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Solution

The fourth proportional to 620,661.40, 930,992.10 and 221,315.20 is: 331,972.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    620,661.40 : 930,992.10 = 221,315.20 : x
  2. Step 2: Convert to fraction form
    620,661.40/930,992.10 = 221,315.20/x
  3. Step 3: Cross multiply
    620,661.40x = 930,992.10 × 221,315.20
  4. Step 4: Simplify right side
    620,661.40x = 206,042,702,809.92
  5. Step 5: Solve for x
    x = 206,042,702,809.92/620,661.40
  6. Step 6: Final answer
    x = 331,972.80

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Double scale
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Similar ratio
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1.5x scale

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.