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Finding the Fourth Proportional to 621,900.98, 858,239.93 and 349,978.58

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Solution

The fourth proportional to 621,900.98, 858,239.93 and 349,978.58 is: 482,979.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    621,900.98 : 858,239.93 = 349,978.58 : x
  2. Step 2: Convert to fraction form
    621,900.98/858,239.93 = 349,978.58/x
  3. Step 3: Cross multiply
    621,900.98x = 858,239.93 × 349,978.58
  4. Step 4: Simplify right side
    621,900.98x = 300,365,592,000.70
  5. Step 5: Solve for x
    x = 300,365,592,000.70/621,900.98
  6. Step 6: Final answer
    x = 482,979.77

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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.