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Finding the Fourth Proportional to 2,187.65, 3,019.45 and 1,390.82

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Solution

The fourth proportional to 2,187.65, 3,019.45 and 1,390.82 is: 1,919.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,187.65 : 3,019.45 = 1,390.82 : x
  2. Step 2: Convert to fraction form
    2,187.65/3,019.45 = 1,390.82/x
  3. Step 3: Cross multiply
    2,187.65x = 3,019.45 × 1,390.82
  4. Step 4: Simplify right side
    2,187.65x = 4,199,492.87
  5. Step 5: Solve for x
    x = 4,199,492.87/2,187.65
  6. Step 6: Final answer
    x = 1,919.63

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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.