Home / 297.72-411.12-215.28

Finding the Fourth Proportional to 297.72, 411.12 and 215.28

Calculator

Solution

The fourth proportional to 297.72, 411.12 and 215.28 is: 297.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    297.72 : 411.12 = 215.28 : x
  2. Step 2: Convert to fraction form
    297.72/411.12 = 215.28/x
  3. Step 3: Cross multiply
    297.72x = 411.12 × 215.28
  4. Step 4: Simplify right side
    297.72x = 88,505.91
  5. Step 5: Solve for x
    x = 88,505.91/297.72
  6. Step 6: Final answer
    x = 297.28

Related Problems

Find fourth proportional to 148.86, 205.56 and 107.64
Half scale
Find fourth proportional to 595.44, 822.24 and 430.56
Double scale
Find fourth proportional to 298.72, 412.50 and 216.28
Similar ratio
Find fourth proportional to 446.58, 616.68 and 322.92
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.