Home / 922.78-1,385.05-678.57

Finding the Fourth Proportional to 922.78, 1,385.05 and 678.57

Calculator

Solution

The fourth proportional to 922.78, 1,385.05 and 678.57 is: 1,018.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    922.78 : 1,385.05 = 678.57 : x
  2. Step 2: Convert to fraction form
    922.78/1,385.05 = 678.57/x
  3. Step 3: Cross multiply
    922.78x = 1,385.05 × 678.57
  4. Step 4: Simplify right side
    922.78x = 939,853.38
  5. Step 5: Solve for x
    x = 939,853.38/922.78
  6. Step 6: Final answer
    x = 1,018.50

Related Problems

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.