Home / 346.70-478.50-248.78

Finding the Fourth Proportional to 346.70, 478.50 and 248.78

Calculator

Solution

The fourth proportional to 346.70, 478.50 and 248.78 is: 343.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    346.70 : 478.50 = 248.78 : x
  2. Step 2: Convert to fraction form
    346.70/478.50 = 248.78/x
  3. Step 3: Cross multiply
    346.70x = 478.50 × 248.78
  4. Step 4: Simplify right side
    346.70x = 119,041.23
  5. Step 5: Solve for x
    x = 119,041.23/346.70
  6. Step 6: Final answer
    x = 343.36

Related Problems

Find fourth proportional to 173.35, 239.25 and 124.39
Half scale
Find fourth proportional to 693.40, 957 and 497.56
Double scale
Find fourth proportional to 347.70, 479.88 and 249.78
Similar ratio
Find fourth proportional to 520.05, 717.75 and 373.17
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.