Home / 745-1,117.50-289

Finding the Fourth Proportional to 745, 1,117.50 and 289

Calculator

Solution

The fourth proportional to 745, 1,117.50 and 289 is: 433.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    745 : 1,117.50 = 289 : x
  2. Step 2: Convert to fraction form
    745/1,117.50 = 289/x
  3. Step 3: Cross multiply
    745x = 1,117.50 × 289
  4. Step 4: Simplify right side
    745x = 322,957.50
  5. Step 5: Solve for x
    x = 322,957.50/745
  6. Step 6: Final answer
    x = 433.50

Related Problems

Find fourth proportional to 372.50, 558.75 and 144.50
Half scale
Find fourth proportional to 1,490, 2,235 and 578
Double scale
Find fourth proportional to 746, 1,119 and 290
Similar ratio
Find fourth proportional to 1,117.50, 1,676.25 and 433.50
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.