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Finding the Fourth Proportional to 61,239, 91,858.50 and 19,686

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Solution

The fourth proportional to 61,239, 91,858.50 and 19,686 is: 29,529

Step by Step Solution

  1. Step 1: Write the proportion equation
    61,239 : 91,858.50 = 19,686 : x
  2. Step 2: Convert to fraction form
    61,239/91,858.50 = 19,686/x
  3. Step 3: Cross multiply
    61,239x = 91,858.50 × 19,686
  4. Step 4: Simplify right side
    61,239x = 1,808,326,431
  5. Step 5: Solve for x
    x = 1,808,326,431/61,239
  6. Step 6: Final answer
    x = 29,529

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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.