Home / 665,345.09-918,175.31-378,865.17

Finding the Fourth Proportional to 665,345.09, 918,175.31 and 378,865.17

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Solution

The fourth proportional to 665,345.09, 918,175.31 and 378,865.17 is: 522,833.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    665,345.09 : 918,175.31 = 378,865.17 : x
  2. Step 2: Convert to fraction form
    665,345.09/918,175.31 = 378,865.17/x
  3. Step 3: Cross multiply
    665,345.09x = 918,175.31 × 378,865.17
  4. Step 4: Simplify right side
    665,345.09x = 347,864,645,860.12
  5. Step 5: Solve for x
    x = 347,864,645,860.12/665,345.09
  6. Step 6: Final answer
    x = 522,833.42

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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.