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Finding the Fourth Proportional to 21,078.98, 29,079.04 and 12,576.23

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Solution

The fourth proportional to 21,078.98, 29,079.04 and 12,576.23 is: 17,349.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,078.98 : 29,079.04 = 12,576.23 : x
  2. Step 2: Convert to fraction form
    21,078.98/29,079.04 = 12,576.23/x
  3. Step 3: Cross multiply
    21,078.98x = 29,079.04 × 12,576.23
  4. Step 4: Simplify right side
    21,078.98x = 365,704,632.34
  5. Step 5: Solve for x
    x = 365,704,632.34/21,078.98
  6. Step 6: Final answer
    x = 17,349.26

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1.5x scale

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.