Home / 531.78-797.76-257.70

Finding the Fourth Proportional to 531.78, 797.76 and 257.70

Calculator

Solution

The fourth proportional to 531.78, 797.76 and 257.70 is: 386.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    531.78 : 797.76 = 257.70 : x
  2. Step 2: Convert to fraction form
    531.78/797.76 = 257.70/x
  3. Step 3: Cross multiply
    531.78x = 797.76 × 257.70
  4. Step 4: Simplify right side
    531.78x = 205,582.75
  5. Step 5: Solve for x
    x = 205,582.75/531.78
  6. Step 6: Final answer
    x = 386.59

Related Problems

Find fourth proportional to 265.89, 398.88 and 128.85
Half scale
Find fourth proportional to 1,063.56, 1,595.52 and 515.40
Double scale
Find fourth proportional to 532.78, 799.26 and 258.70
Similar ratio
Find fourth proportional to 797.67, 1,196.64 and 386.55
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.