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Finding the Fourth Proportional to 21,959.51, 30,301.49 and 12,398.67

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Solution

The fourth proportional to 21,959.51, 30,301.49 and 12,398.67 is: 17,108.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,959.51 : 30,301.49 = 12,398.67 : x
  2. Step 2: Convert to fraction form
    21,959.51/30,301.49 = 12,398.67/x
  3. Step 3: Cross multiply
    21,959.51x = 30,301.49 × 12,398.67
  4. Step 4: Simplify right side
    21,959.51x = 375,698,206.01
  5. Step 5: Solve for x
    x = 375,698,206.01/21,959.51
  6. Step 6: Final answer
    x = 17,108.68

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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.