Home / 2,987.77-4,122.81-1,728.63

Finding the Fourth Proportional to 2,987.77, 4,122.81 and 1,728.63

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Solution

The fourth proportional to 2,987.77, 4,122.81 and 1,728.63 is: 2,385.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,987.77 : 4,122.81 = 1,728.63 : x
  2. Step 2: Convert to fraction form
    2,987.77/4,122.81 = 1,728.63/x
  3. Step 3: Cross multiply
    2,987.77x = 4,122.81 × 1,728.63
  4. Step 4: Simplify right side
    2,987.77x = 7,126,813.05
  5. Step 5: Solve for x
    x = 7,126,813.05/2,987.77
  6. Step 6: Final answer
    x = 2,385.33

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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.