Home / 644-966.40-340

Finding the Fourth Proportional to 644, 966.40 and 340

Calculator

Solution

The fourth proportional to 644, 966.40 and 340 is: 510.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    644 : 966.40 = 340 : x
  2. Step 2: Convert to fraction form
    644/966.40 = 340/x
  3. Step 3: Cross multiply
    644x = 966.40 × 340
  4. Step 4: Simplify right side
    644x = 328,576
  5. Step 5: Solve for x
    x = 328,576/644
  6. Step 6: Final answer
    x = 510.21

Related Problems

Find fourth proportional to 322, 483.20 and 170
Half scale
Find fourth proportional to 1,288, 1,932.80 and 680
Double scale
Find fourth proportional to 645, 967.90 and 341
Similar ratio
Find fourth proportional to 966, 1,449.60 and 510
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.