Home / 2,121-2,927.12-1,189.50

Finding the Fourth Proportional to 2,121, 2,927.12 and 1,189.50

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Solution

The fourth proportional to 2,121, 2,927.12 and 1,189.50 is: 1,641.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,121 : 2,927.12 = 1,189.50 : x
  2. Step 2: Convert to fraction form
    2,121/2,927.12 = 1,189.50/x
  3. Step 3: Cross multiply
    2,121x = 2,927.12 × 1,189.50
  4. Step 4: Simplify right side
    2,121x = 3,481,803.29
  5. Step 5: Solve for x
    x = 3,481,803.29/2,121
  6. Step 6: Final answer
    x = 1,641.59

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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.