Home / 21,138.63-29,143.65-18,186.18

Finding the Fourth Proportional to 21,138.63, 29,143.65 and 18,186.18

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Solution

The fourth proportional to 21,138.63, 29,143.65 and 18,186.18 is: 25,073.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,138.63 : 29,143.65 = 18,186.18 : x
  2. Step 2: Convert to fraction form
    21,138.63/29,143.65 = 18,186.18/x
  3. Step 3: Cross multiply
    21,138.63x = 29,143.65 × 18,186.18
  4. Step 4: Simplify right side
    21,138.63x = 530,011,664.76
  5. Step 5: Solve for x
    x = 530,011,664.76/21,138.63
  6. Step 6: Final answer
    x = 25,073.13

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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.