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Finding the Fourth Proportional to 676,920.94, 934,118.85 and 405,138.58

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Solution

The fourth proportional to 676,920.94, 934,118.85 and 405,138.58 is: 559,072.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    676,920.94 : 934,118.85 = 405,138.58 : x
  2. Step 2: Convert to fraction form
    676,920.94/934,118.85 = 405,138.58/x
  3. Step 3: Cross multiply
    676,920.94x = 934,118.85 × 405,138.58
  4. Step 4: Simplify right side
    676,920.94x = 378,447,584,440.23
  5. Step 5: Solve for x
    x = 378,447,584,440.23/676,920.94
  6. Step 6: Final answer
    x = 559,072.06

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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.