Home / 103.58-142.81-64.70

Finding the Fourth Proportional to 103.58, 142.81 and 64.70

Calculator

Solution

The fourth proportional to 103.58, 142.81 and 64.70 is: 89.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    103.58 : 142.81 = 64.70 : x
  2. Step 2: Convert to fraction form
    103.58/142.81 = 64.70/x
  3. Step 3: Cross multiply
    103.58x = 142.81 × 64.70
  4. Step 4: Simplify right side
    103.58x = 9,239.81
  5. Step 5: Solve for x
    x = 9,239.81/103.58
  6. Step 6: Final answer
    x = 89.20

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.