Home / 550.80-760.50-385.38

Finding the Fourth Proportional to 550.80, 760.50 and 385.38

Calculator

Solution

The fourth proportional to 550.80, 760.50 and 385.38 is: 532.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    550.80 : 760.50 = 385.38 : x
  2. Step 2: Convert to fraction form
    550.80/760.50 = 385.38/x
  3. Step 3: Cross multiply
    550.80x = 760.50 × 385.38
  4. Step 4: Simplify right side
    550.80x = 293,081.49
  5. Step 5: Solve for x
    x = 293,081.49/550.80
  6. Step 6: Final answer
    x = 532.10

Related Problems

Find fourth proportional to 275.40, 380.25 and 192.69
Half scale
Find fourth proportional to 1,101.60, 1,521 and 770.76
Double scale
Find fourth proportional to 551.80, 761.88 and 386.38
Similar ratio
Find fourth proportional to 826.20, 1,140.75 and 578.07
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.