Home / 678.50-1,018.20-332

Finding the Fourth Proportional to 678.50, 1,018.20 and 332

Calculator

Solution

The fourth proportional to 678.50, 1,018.20 and 332 is: 498.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    678.50 : 1,018.20 = 332 : x
  2. Step 2: Convert to fraction form
    678.50/1,018.20 = 332/x
  3. Step 3: Cross multiply
    678.50x = 1,018.20 × 332
  4. Step 4: Simplify right side
    678.50x = 338,042.40
  5. Step 5: Solve for x
    x = 338,042.40/678.50
  6. Step 6: Final answer
    x = 498.22

Related Problems

Find fourth proportional to 339.25, 509.10 and 166
Half scale
Find fourth proportional to 1,357, 2,036.40 and 664
Double scale
Find fourth proportional to 679.50, 1,019.70 and 333
Similar ratio
Find fourth proportional to 1,017.75, 1,527.30 and 498
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.