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Finding the Fourth Proportional to 720,021.40, 1,080,032.10 and 221,385.40

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Solution

The fourth proportional to 720,021.40, 1,080,032.10 and 221,385.40 is: 332,078.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    720,021.40 : 1,080,032.10 = 221,385.40 : x
  2. Step 2: Convert to fraction form
    720,021.40/1,080,032.10 = 221,385.40/x
  3. Step 3: Cross multiply
    720,021.40x = 1,080,032.10 × 221,385.40
  4. Step 4: Simplify right side
    720,021.40x = 239,103,338,471.34
  5. Step 5: Solve for x
    x = 239,103,338,471.34/720,021.40
  6. Step 6: Final answer
    x = 332,078.10

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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.