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Finding the Fourth Proportional to 42,936, 64,404 and 18,312

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Solution

The fourth proportional to 42,936, 64,404 and 18,312 is: 27,468

Step by Step Solution

  1. Step 1: Write the proportion equation
    42,936 : 64,404 = 18,312 : x
  2. Step 2: Convert to fraction form
    42,936/64,404 = 18,312/x
  3. Step 3: Cross multiply
    42,936x = 64,404 × 18,312
  4. Step 4: Simplify right side
    42,936x = 1,179,366,048
  5. Step 5: Solve for x
    x = 1,179,366,048/42,936
  6. Step 6: Final answer
    x = 27,468

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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.