Home / 72.12-99.45-64.02

Finding the Fourth Proportional to 72.12, 99.45 and 64.02

Calculator

Solution

The fourth proportional to 72.12, 99.45 and 64.02 is: 88.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    72.12 : 99.45 = 64.02 : x
  2. Step 2: Convert to fraction form
    72.12/99.45 = 64.02/x
  3. Step 3: Cross multiply
    72.12x = 99.45 × 64.02
  4. Step 4: Simplify right side
    72.12x = 6,366.79
  5. Step 5: Solve for x
    x = 6,366.79/72.12
  6. Step 6: Final answer
    x = 88.28

Related Problems

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.