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Finding the Fourth Proportional to 918,245, 1,376,578.65 and 319,128.32

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Solution

The fourth proportional to 918,245, 1,376,578.65 and 319,128.32 is: 478,418.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    918,245 : 1,376,578.65 = 319,128.32 : x
  2. Step 2: Convert to fraction form
    918,245/1,376,578.65 = 319,128.32/x
  3. Step 3: Cross multiply
    918,245x = 1,376,578.65 × 319,128.32
  4. Step 4: Simplify right side
    918,245x = 439,305,231,922.37
  5. Step 5: Solve for x
    x = 439,305,231,922.37/918,245
  6. Step 6: Final answer
    x = 478,418.32

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.