Home / 700.40-1,043.62-623.78

Finding the Fourth Proportional to 700.40, 1,043.62 and 623.78

Calculator

Solution

The fourth proportional to 700.40, 1,043.62 and 623.78 is: 929.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    700.40 : 1,043.62 = 623.78 : x
  2. Step 2: Convert to fraction form
    700.40/1,043.62 = 623.78/x
  3. Step 3: Cross multiply
    700.40x = 1,043.62 × 623.78
  4. Step 4: Simplify right side
    700.40x = 650,989.28
  5. Step 5: Solve for x
    x = 650,989.28/700.40
  6. Step 6: Final answer
    x = 929.45

Related Problems

Find fourth proportional to 350.20, 521.81 and 311.89
Half scale
Find fourth proportional to 1,400.80, 2,087.24 and 1,247.56
Double scale
Find fourth proportional to 701.40, 1,045.11 and 624.78
Similar ratio
Find fourth proportional to 1,050.60, 1,565.43 and 935.67
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.