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Finding the Fourth Proportional to 665,330.66, 918,165.09 and 378,851.90

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Solution

The fourth proportional to 665,330.66, 918,165.09 and 378,851.90 is: 522,820.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    665,330.66 : 918,165.09 = 378,851.90 : x
  2. Step 2: Convert to fraction form
    665,330.66/918,165.09 = 378,851.90/x
  3. Step 3: Cross multiply
    665,330.66x = 918,165.09 × 378,851.90
  4. Step 4: Simplify right side
    665,330.66x = 347,848,588,860.17
  5. Step 5: Solve for x
    x = 347,848,588,860.17/665,330.66
  6. Step 6: Final answer
    x = 522,820.62

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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.