Home / 390,255.36-538,562.89-220,485.84

Finding the Fourth Proportional to 390,255.36, 538,562.89 and 220,485.84

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Solution

The fourth proportional to 390,255.36, 538,562.89 and 220,485.84 is: 304,276.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,255.36 : 538,562.89 = 220,485.84 : x
  2. Step 2: Convert to fraction form
    390,255.36/538,562.89 = 220,485.84/x
  3. Step 3: Cross multiply
    390,255.36x = 538,562.89 × 220,485.84
  4. Step 4: Simplify right side
    390,255.36x = 118,745,491,194.48
  5. Step 5: Solve for x
    x = 118,745,491,194.48/390,255.36
  6. Step 6: Final answer
    x = 304,276.39

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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.