Home / 21,855.07-30,152.95-12,905.56

Finding the Fourth Proportional to 21,855.07, 30,152.95 and 12,905.56

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Solution

The fourth proportional to 21,855.07, 30,152.95 and 12,905.56 is: 17,805.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,855.07 : 30,152.95 = 12,905.56 : x
  2. Step 2: Convert to fraction form
    21,855.07/30,152.95 = 12,905.56/x
  3. Step 3: Cross multiply
    21,855.07x = 30,152.95 × 12,905.56
  4. Step 4: Simplify right side
    21,855.07x = 389,140,705.40
  5. Step 5: Solve for x
    x = 389,140,705.40/21,855.07
  6. Step 6: Final answer
    x = 17,805.51

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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.