Home / 964.98-1,330.29-688.50

Finding the Fourth Proportional to 964.98, 1,330.29 and 688.50

Calculator

Solution

The fourth proportional to 964.98, 1,330.29 and 688.50 is: 949.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    964.98 : 1,330.29 = 688.50 : x
  2. Step 2: Convert to fraction form
    964.98/1,330.29 = 688.50/x
  3. Step 3: Cross multiply
    964.98x = 1,330.29 × 688.50
  4. Step 4: Simplify right side
    964.98x = 915,904.67
  5. Step 5: Solve for x
    x = 915,904.67/964.98
  6. Step 6: Final answer
    x = 949.14

Related Problems

Find fourth proportional to 482.49, 665.15 and 344.25
Half scale
Find fourth proportional to 1,929.96, 2,660.58 and 1,377
Double scale
Find fourth proportional to 965.98, 1,331.67 and 689.50
Similar ratio
Find fourth proportional to 1,447.47, 1,995.44 and 1,032.75
1.5x scale

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.