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Finding the Fourth Proportional to 390,120.88, 538,410.62 and 220,365.94

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Solution

The fourth proportional to 390,120.88, 538,410.62 and 220,365.94 is: 304,129.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,120.88 : 538,410.62 = 220,365.94 : x
  2. Step 2: Convert to fraction form
    390,120.88/538,410.62 = 220,365.94/x
  3. Step 3: Cross multiply
    390,120.88x = 538,410.62 × 220,365.94
  4. Step 4: Simplify right side
    390,120.88x = 118,647,358,588.40
  5. Step 5: Solve for x
    x = 118,647,358,588.40/390,120.88
  6. Step 6: Final answer
    x = 304,129.74

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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.