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Finding the Fourth Proportional to 53,912.40, 80,868.60 and 39,915.60

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Solution

The fourth proportional to 53,912.40, 80,868.60 and 39,915.60 is: 59,873.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    53,912.40 : 80,868.60 = 39,915.60 : x
  2. Step 2: Convert to fraction form
    53,912.40/80,868.60 = 39,915.60/x
  3. Step 3: Cross multiply
    53,912.40x = 80,868.60 × 39,915.60
  4. Step 4: Simplify right side
    53,912.40x = 3,227,918,690.16
  5. Step 5: Solve for x
    x = 3,227,918,690.16/53,912.40
  6. Step 6: Final answer
    x = 59,873.40

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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.