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Finding the Fourth Proportional to 17,929.70, 26,908.47 and 12,421.64

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Solution

The fourth proportional to 17,929.70, 26,908.47 and 12,421.64 is: 18,642.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    17,929.70 : 26,908.47 = 12,421.64 : x
  2. Step 2: Convert to fraction form
    17,929.70/26,908.47 = 12,421.64/x
  3. Step 3: Cross multiply
    17,929.70x = 26,908.47 × 12,421.64
  4. Step 4: Simplify right side
    17,929.70x = 334,247,327.29
  5. Step 5: Solve for x
    x = 334,247,327.29/17,929.70
  6. Step 6: Final answer
    x = 18,642.10

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1.5x scale

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.