Home / 1,077.78-1,487.28-612

Finding the Fourth Proportional to 1,077.78, 1,487.28 and 612

Calculator

Solution

The fourth proportional to 1,077.78, 1,487.28 and 612 is: 844.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,077.78 : 1,487.28 = 612 : x
  2. Step 2: Convert to fraction form
    1,077.78/1,487.28 = 612/x
  3. Step 3: Cross multiply
    1,077.78x = 1,487.28 × 612
  4. Step 4: Simplify right side
    1,077.78x = 910,215.36
  5. Step 5: Solve for x
    x = 910,215.36/1,077.78
  6. Step 6: Final answer
    x = 844.53

Related Problems

Find fourth proportional to 538.89, 743.64 and 306
Half scale
Find fourth proportional to 2,155.56, 2,974.56 and 1,224
Double scale
Find fourth proportional to 1,078.78, 1,488.66 and 613
Similar ratio
Find fourth proportional to 1,616.67, 2,230.92 and 918
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.