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Finding the Fourth Proportional to 29,387.78, 40,554.56 and 16,640

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Solution

The fourth proportional to 29,387.78, 40,554.56 and 16,640 is: 22,962.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    29,387.78 : 40,554.56 = 16,640 : x
  2. Step 2: Convert to fraction form
    29,387.78/40,554.56 = 16,640/x
  3. Step 3: Cross multiply
    29,387.78x = 40,554.56 × 16,640
  4. Step 4: Simplify right side
    29,387.78x = 674,827,878.40
  5. Step 5: Solve for x
    x = 674,827,878.40/29,387.78
  6. Step 6: Final answer
    x = 22,962.87

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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.