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Finding the Fourth Proportional to 18,889.24, 26,088.90 and 12,590.68

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Solution

The fourth proportional to 18,889.24, 26,088.90 and 12,590.68 is: 17,389.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,889.24 : 26,088.90 = 12,590.68 : x
  2. Step 2: Convert to fraction form
    18,889.24/26,088.90 = 12,590.68/x
  3. Step 3: Cross multiply
    18,889.24x = 26,088.90 × 12,590.68
  4. Step 4: Simplify right side
    18,889.24x = 328,476,991.45
  5. Step 5: Solve for x
    x = 328,476,991.45/18,889.24
  6. Step 6: Final answer
    x = 17,389.64

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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.