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Finding the Fourth Proportional to 2,114.99, 2,918.76 and 1,405.61

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Solution

The fourth proportional to 2,114.99, 2,918.76 and 1,405.61 is: 1,939.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,114.99 : 2,918.76 = 1,405.61 : x
  2. Step 2: Convert to fraction form
    2,114.99/2,918.76 = 1,405.61/x
  3. Step 3: Cross multiply
    2,114.99x = 2,918.76 × 1,405.61
  4. Step 4: Simplify right side
    2,114.99x = 4,102,623.65
  5. Step 5: Solve for x
    x = 4,102,623.65/2,114.99
  6. Step 6: Final answer
    x = 1,939.79

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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.