Home / 1,129.84-1,558.98-664

Finding the Fourth Proportional to 1,129.84, 1,558.98 and 664

Calculator

Solution

The fourth proportional to 1,129.84, 1,558.98 and 664 is: 916.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,129.84 : 1,558.98 = 664 : x
  2. Step 2: Convert to fraction form
    1,129.84/1,558.98 = 664/x
  3. Step 3: Cross multiply
    1,129.84x = 1,558.98 × 664
  4. Step 4: Simplify right side
    1,129.84x = 1,035,162.72
  5. Step 5: Solve for x
    x = 1,035,162.72/1,129.84
  6. Step 6: Final answer
    x = 916.20

Related Problems

Find fourth proportional to 564.92, 779.49 and 332
Half scale
Find fourth proportional to 2,259.68, 3,117.96 and 1,328
Double scale
Find fourth proportional to 1,130.84, 1,560.36 and 665
Similar ratio
Find fourth proportional to 1,694.76, 2,338.47 and 996
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.