Home / 989-1,483.50-305

Finding the Fourth Proportional to 989, 1,483.50 and 305

Calculator

Solution

The fourth proportional to 989, 1,483.50 and 305 is: 457.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    989 : 1,483.50 = 305 : x
  2. Step 2: Convert to fraction form
    989/1,483.50 = 305/x
  3. Step 3: Cross multiply
    989x = 1,483.50 × 305
  4. Step 4: Simplify right side
    989x = 452,467.50
  5. Step 5: Solve for x
    x = 452,467.50/989
  6. Step 6: Final answer
    x = 457.50

Related Problems

Find fourth proportional to 494.50, 741.75 and 152.50
Half scale
Find fourth proportional to 1,978, 2,967 and 610
Double scale
Find fourth proportional to 990, 1,485 and 306
Similar ratio
Find fourth proportional to 1,483.50, 2,225.25 and 457.50
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.