Home / 915.68-1,372.80-368

Finding the Fourth Proportional to 915.68, 1,372.80 and 368

Calculator

Solution

The fourth proportional to 915.68, 1,372.80 and 368 is: 551.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    915.68 : 1,372.80 = 368 : x
  2. Step 2: Convert to fraction form
    915.68/1,372.80 = 368/x
  3. Step 3: Cross multiply
    915.68x = 1,372.80 × 368
  4. Step 4: Simplify right side
    915.68x = 505,190.40
  5. Step 5: Solve for x
    x = 505,190.40/915.68
  6. Step 6: Final answer
    x = 551.71

Related Problems

Find fourth proportional to 457.84, 686.40 and 184
Half scale
Find fourth proportional to 1,831.36, 2,745.60 and 736
Double scale
Find fourth proportional to 916.68, 1,374.30 and 369
Similar ratio
Find fourth proportional to 1,373.52, 2,059.20 and 552
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.