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Finding the Fourth Proportional to 388,977, 536,788.74 and 210,129

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Solution

The fourth proportional to 388,977, 536,788.74 and 210,129 is: 289,978.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    388,977 : 536,788.74 = 210,129 : x
  2. Step 2: Convert to fraction form
    388,977/536,788.74 = 210,129/x
  3. Step 3: Cross multiply
    388,977x = 536,788.74 × 210,129
  4. Step 4: Simplify right side
    388,977x = 112,794,881,147.46
  5. Step 5: Solve for x
    x = 112,794,881,147.46/388,977
  6. Step 6: Final answer
    x = 289,978.28

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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.