Home / 390,556.45-538,942.48-218,444.60

Finding the Fourth Proportional to 390,556.45, 538,942.48 and 218,444.60

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Solution

The fourth proportional to 390,556.45, 538,942.48 and 218,444.60 is: 301,439.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,556.45 : 538,942.48 = 218,444.60 : x
  2. Step 2: Convert to fraction form
    390,556.45/538,942.48 = 218,444.60/x
  3. Step 3: Cross multiply
    390,556.45x = 538,942.48 × 218,444.60
  4. Step 4: Simplify right side
    390,556.45x = 117,729,072,236.30
  5. Step 5: Solve for x
    x = 117,729,072,236.30/390,556.45
  6. Step 6: Final answer
    x = 301,439.32

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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.