Home / 1,985.32-2,739.64-1,145.80

Finding the Fourth Proportional to 1,985.32, 2,739.64 and 1,145.80

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Solution

The fourth proportional to 1,985.32, 2,739.64 and 1,145.80 is: 1,581.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,985.32 : 2,739.64 = 1,145.80 : x
  2. Step 2: Convert to fraction form
    1,985.32/2,739.64 = 1,145.80/x
  3. Step 3: Cross multiply
    1,985.32x = 2,739.64 × 1,145.80
  4. Step 4: Simplify right side
    1,985.32x = 3,139,079.51
  5. Step 5: Solve for x
    x = 3,139,079.51/1,985.32
  6. Step 6: Final answer
    x = 1,581.15

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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.