Home / 477.39-658.71-290.78

Finding the Fourth Proportional to 477.39, 658.71 and 290.78

Calculator

Solution

The fourth proportional to 477.39, 658.71 and 290.78 is: 401.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    477.39 : 658.71 = 290.78 : x
  2. Step 2: Convert to fraction form
    477.39/658.71 = 290.78/x
  3. Step 3: Cross multiply
    477.39x = 658.71 × 290.78
  4. Step 4: Simplify right side
    477.39x = 191,539.69
  5. Step 5: Solve for x
    x = 191,539.69/477.39
  6. Step 6: Final answer
    x = 401.22

Related Problems

Find fourth proportional to 238.70, 329.36 and 145.39
Half scale
Find fourth proportional to 954.78, 1,317.42 and 581.56
Double scale
Find fourth proportional to 478.39, 660.09 and 291.78
Similar ratio
Find fourth proportional to 716.09, 988.07 and 436.17
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.