Home / 1,131.45-1,561.21-711.51

Finding the Fourth Proportional to 1,131.45, 1,561.21 and 711.51

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Solution

The fourth proportional to 1,131.45, 1,561.21 and 711.51 is: 981.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,131.45 : 1,561.21 = 711.51 : x
  2. Step 2: Convert to fraction form
    1,131.45/1,561.21 = 711.51/x
  3. Step 3: Cross multiply
    1,131.45x = 1,561.21 × 711.51
  4. Step 4: Simplify right side
    1,131.45x = 1,110,816.53
  5. Step 5: Solve for x
    x = 1,110,816.53/1,131.45
  6. Step 6: Final answer
    x = 981.76

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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.