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Finding the Fourth Proportional to 39,915.60, 59,880.60 and 20,144.40

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Solution

The fourth proportional to 39,915.60, 59,880.60 and 20,144.40 is: 30,220.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,915.60 : 59,880.60 = 20,144.40 : x
  2. Step 2: Convert to fraction form
    39,915.60/59,880.60 = 20,144.40/x
  3. Step 3: Cross multiply
    39,915.60x = 59,880.60 × 20,144.40
  4. Step 4: Simplify right side
    39,915.60x = 1,206,258,758.64
  5. Step 5: Solve for x
    x = 1,206,258,758.64/39,915.60
  6. Step 6: Final answer
    x = 30,220.23

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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.