Home / 1,415.40-2,112.99-1,207.80

Finding the Fourth Proportional to 1,415.40, 2,112.99 and 1,207.80

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Solution

The fourth proportional to 1,415.40, 2,112.99 and 1,207.80 is: 1,803.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,415.40 : 2,112.99 = 1,207.80 : x
  2. Step 2: Convert to fraction form
    1,415.40/2,112.99 = 1,207.80/x
  3. Step 3: Cross multiply
    1,415.40x = 2,112.99 × 1,207.80
  4. Step 4: Simplify right side
    1,415.40x = 2,552,069.32
  5. Step 5: Solve for x
    x = 2,552,069.32/1,415.40
  6. Step 6: Final answer
    x = 1,803.07

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.