Home / 1,985.87-2,978.94-525

Finding the Fourth Proportional to 1,985.87, 2,978.94 and 525

Calculator

Solution

The fourth proportional to 1,985.87, 2,978.94 and 525 is: 787.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,985.87 : 2,978.94 = 525 : x
  2. Step 2: Convert to fraction form
    1,985.87/2,978.94 = 525/x
  3. Step 3: Cross multiply
    1,985.87x = 2,978.94 × 525
  4. Step 4: Simplify right side
    1,985.87x = 1,563,943.50
  5. Step 5: Solve for x
    x = 1,563,943.50/1,985.87
  6. Step 6: Final answer
    x = 787.54

Related Problems

Find fourth proportional to 992.93, 1,489.47 and 262.50
Half scale
Find fourth proportional to 3,971.73, 5,957.88 and 1,050
Double scale
Find fourth proportional to 1,986.87, 2,980.44 and 526
Similar ratio
Find fourth proportional to 2,978.80, 4,468.41 and 787.50
1.5x scale

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.