Home / 389,913.12-538,019.22-220,143.60

Finding the Fourth Proportional to 389,913.12, 538,019.22 and 220,143.60

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Solution

The fourth proportional to 389,913.12, 538,019.22 and 220,143.60 is: 303,763.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    389,913.12 : 538,019.22 = 220,143.60 : x
  2. Step 2: Convert to fraction form
    389,913.12/538,019.22 = 220,143.60/x
  3. Step 3: Cross multiply
    389,913.12x = 538,019.22 × 220,143.60
  4. Step 4: Simplify right side
    389,913.12x = 118,441,487,959.99
  5. Step 5: Solve for x
    x = 118,441,487,959.99/389,913.12
  6. Step 6: Final answer
    x = 303,763.79

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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.