Home / 389,915.12-538,021.98-220,145.60

Finding the Fourth Proportional to 389,915.12, 538,021.98 and 220,145.60

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Solution

The fourth proportional to 389,915.12, 538,021.98 and 220,145.60 is: 303,766.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    389,915.12 : 538,021.98 = 220,145.60 : x
  2. Step 2: Convert to fraction form
    389,915.12/538,021.98 = 220,145.60/x
  3. Step 3: Cross multiply
    389,915.12x = 538,021.98 × 220,145.60
  4. Step 4: Simplify right side
    389,915.12x = 118,443,171,600.29
  5. Step 5: Solve for x
    x = 118,443,171,600.29/389,915.12
  6. Step 6: Final answer
    x = 303,766.55

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.