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Finding the Fourth Proportional to 665,651.31, 918,374.38 and 378,968.41

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Solution

The fourth proportional to 665,651.31, 918,374.38 and 378,968.41 is: 522,848.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    665,651.31 : 918,374.38 = 378,968.41 : x
  2. Step 2: Convert to fraction form
    665,651.31/918,374.38 = 378,968.41/x
  3. Step 3: Cross multiply
    665,651.31x = 918,374.38 × 378,968.41
  4. Step 4: Simplify right side
    665,651.31x = 348,034,878,573.34
  5. Step 5: Solve for x
    x = 348,034,878,573.34/665,651.31
  6. Step 6: Final answer
    x = 522,848.63

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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.