Home / 20,872.12-28,812.54-12,487

Finding the Fourth Proportional to 20,872.12, 28,812.54 and 12,487

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Solution

The fourth proportional to 20,872.12, 28,812.54 and 12,487 is: 17,237.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,872.12 : 28,812.54 = 12,487 : x
  2. Step 2: Convert to fraction form
    20,872.12/28,812.54 = 12,487/x
  3. Step 3: Cross multiply
    20,872.12x = 28,812.54 × 12,487
  4. Step 4: Simplify right side
    20,872.12x = 359,782,186.98
  5. Step 5: Solve for x
    x = 359,782,186.98/20,872.12
  6. Step 6: Final answer
    x = 17,237.45

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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.