Home / 555.57-767.16-390.15

Finding the Fourth Proportional to 555.57, 767.16 and 390.15

Calculator

Solution

The fourth proportional to 555.57, 767.16 and 390.15 is: 538.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    555.57 : 767.16 = 390.15 : x
  2. Step 2: Convert to fraction form
    555.57/767.16 = 390.15/x
  3. Step 3: Cross multiply
    555.57x = 767.16 × 390.15
  4. Step 4: Simplify right side
    555.57x = 299,307.47
  5. Step 5: Solve for x
    x = 299,307.47/555.57
  6. Step 6: Final answer
    x = 538.74

Related Problems

Find fourth proportional to 277.79, 383.58 and 195.08
Half scale
Find fourth proportional to 1,111.14, 1,534.32 and 780.30
Double scale
Find fourth proportional to 556.57, 768.54 and 391.15
Similar ratio
Find fourth proportional to 833.36, 1,150.74 and 585.23
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.