Home / 87.15-130.62-39

Finding the Fourth Proportional to 87.15, 130.62 and 39

Calculator

Solution

The fourth proportional to 87.15, 130.62 and 39 is: 58.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    87.15 : 130.62 = 39 : x
  2. Step 2: Convert to fraction form
    87.15/130.62 = 39/x
  3. Step 3: Cross multiply
    87.15x = 130.62 × 39
  4. Step 4: Simplify right side
    87.15x = 5,094.18
  5. Step 5: Solve for x
    x = 5,094.18/87.15
  6. Step 6: Final answer
    x = 58.45

Related Problems

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.