Home / 905-1,357.50-297

Finding the Fourth Proportional to 905, 1,357.50 and 297

Calculator

Solution

The fourth proportional to 905, 1,357.50 and 297 is: 445.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    905 : 1,357.50 = 297 : x
  2. Step 2: Convert to fraction form
    905/1,357.50 = 297/x
  3. Step 3: Cross multiply
    905x = 1,357.50 × 297
  4. Step 4: Simplify right side
    905x = 403,177.50
  5. Step 5: Solve for x
    x = 403,177.50/905
  6. Step 6: Final answer
    x = 445.50

Related Problems

Find fourth proportional to 452.50, 678.75 and 148.50
Half scale
Find fourth proportional to 1,810, 2,715 and 594
Double scale
Find fourth proportional to 906, 1,359 and 298
Similar ratio
Find fourth proportional to 1,357.50, 2,036.25 and 445.50
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.