Home / 540.78-811.17-348

Finding the Fourth Proportional to 540.78, 811.17 and 348

Calculator

Solution

The fourth proportional to 540.78, 811.17 and 348 is: 522

Step by Step Solution

  1. Step 1: Write the proportion equation
    540.78 : 811.17 = 348 : x
  2. Step 2: Convert to fraction form
    540.78/811.17 = 348/x
  3. Step 3: Cross multiply
    540.78x = 811.17 × 348
  4. Step 4: Simplify right side
    540.78x = 282,287.16
  5. Step 5: Solve for x
    x = 282,287.16/540.78
  6. Step 6: Final answer
    x = 522

Related Problems

Find fourth proportional to 270.39, 405.59 and 174
Half scale
Find fourth proportional to 1,081.56, 1,622.34 and 696
Double scale
Find fourth proportional to 541.78, 812.67 and 349
Similar ratio
Find fourth proportional to 811.17, 1,216.76 and 522
1.5x scale

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.