Home / 21,840.18-30,136.93-12,278.13

Finding the Fourth Proportional to 21,840.18, 30,136.93 and 12,278.13

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Solution

The fourth proportional to 21,840.18, 30,136.93 and 12,278.13 is: 16,942.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,840.18 : 30,136.93 = 12,278.13 : x
  2. Step 2: Convert to fraction form
    21,840.18/30,136.93 = 12,278.13/x
  3. Step 3: Cross multiply
    21,840.18x = 30,136.93 × 12,278.13
  4. Step 4: Simplify right side
    21,840.18x = 370,025,144.34
  5. Step 5: Solve for x
    x = 370,025,144.34/21,840.18
  6. Step 6: Final answer
    x = 16,942.40

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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.