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Finding the Fourth Proportional to 390,511.41, 538,891.02 and 220,749.18

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Solution

The fourth proportional to 390,511.41, 538,891.02 and 220,749.18 is: 304,625.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,511.41 : 538,891.02 = 220,749.18 : x
  2. Step 2: Convert to fraction form
    390,511.41/538,891.02 = 220,749.18/x
  3. Step 3: Cross multiply
    390,511.41x = 538,891.02 × 220,749.18
  4. Step 4: Simplify right side
    390,511.41x = 118,959,750,774.36
  5. Step 5: Solve for x
    x = 118,959,750,774.36/390,511.41
  6. Step 6: Final answer
    x = 304,625.54

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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.