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Finding the Fourth Proportional to 427,021.60, 640,532.40 and 217,069.60

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Solution

The fourth proportional to 427,021.60, 640,532.40 and 217,069.60 is: 325,604.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    427,021.60 : 640,532.40 = 217,069.60 : x
  2. Step 2: Convert to fraction form
    427,021.60/640,532.40 = 217,069.60/x
  3. Step 3: Cross multiply
    427,021.60x = 640,532.40 × 217,069.60
  4. Step 4: Simplify right side
    427,021.60x = 139,040,111,855.04
  5. Step 5: Solve for x
    x = 139,040,111,855.04/427,021.60
  6. Step 6: Final answer
    x = 325,604.40

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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.