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Finding the Fourth Proportional to 390,504.90, 538,889.63 and 220,739.03

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Solution

The fourth proportional to 390,504.90, 538,889.63 and 220,739.03 is: 304,615.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,504.90 : 538,889.63 = 220,739.03 : x
  2. Step 2: Convert to fraction form
    390,504.90/538,889.63 = 220,739.03/x
  3. Step 3: Cross multiply
    390,504.90x = 538,889.63 × 220,739.03
  4. Step 4: Simplify right side
    390,504.90x = 118,953,974,203.26
  5. Step 5: Solve for x
    x = 118,953,974,203.26/390,504.90
  6. Step 6: Final answer
    x = 304,615.83

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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.