Home / 607.86-838.71-345.78

Finding the Fourth Proportional to 607.86, 838.71 and 345.78

Calculator

Solution

The fourth proportional to 607.86, 838.71 and 345.78 is: 477.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    607.86 : 838.71 = 345.78 : x
  2. Step 2: Convert to fraction form
    607.86/838.71 = 345.78/x
  3. Step 3: Cross multiply
    607.86x = 838.71 × 345.78
  4. Step 4: Simplify right side
    607.86x = 290,009.14
  5. Step 5: Solve for x
    x = 290,009.14/607.86
  6. Step 6: Final answer
    x = 477.10

Related Problems

Find fourth proportional to 303.93, 419.36 and 172.89
Half scale
Find fourth proportional to 1,215.72, 1,677.42 and 691.56
Double scale
Find fourth proportional to 608.86, 840.09 and 346.78
Similar ratio
Find fourth proportional to 911.79, 1,258.07 and 518.67
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.