Home / 602.87-831.63-392.78

Finding the Fourth Proportional to 602.87, 831.63 and 392.78

Calculator

Solution

The fourth proportional to 602.87, 831.63 and 392.78 is: 541.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    602.87 : 831.63 = 392.78 : x
  2. Step 2: Convert to fraction form
    602.87/831.63 = 392.78/x
  3. Step 3: Cross multiply
    602.87x = 831.63 × 392.78
  4. Step 4: Simplify right side
    602.87x = 326,647.63
  5. Step 5: Solve for x
    x = 326,647.63/602.87
  6. Step 6: Final answer
    x = 541.82

Related Problems

Find fourth proportional to 301.44, 415.82 and 196.39
Half scale
Find fourth proportional to 1,205.74, 1,663.26 and 785.56
Double scale
Find fourth proportional to 603.87, 833.01 and 393.78
Similar ratio
Find fourth proportional to 904.31, 1,247.45 and 589.17
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.