Home / 740.09-1,021.68-478.28

Finding the Fourth Proportional to 740.09, 1,021.68 and 478.28

Calculator

Solution

The fourth proportional to 740.09, 1,021.68 and 478.28 is: 660.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    740.09 : 1,021.68 = 478.28 : x
  2. Step 2: Convert to fraction form
    740.09/1,021.68 = 478.28/x
  3. Step 3: Cross multiply
    740.09x = 1,021.68 × 478.28
  4. Step 4: Simplify right side
    740.09x = 488,644.00
  5. Step 5: Solve for x
    x = 488,644.00/740.09
  6. Step 6: Final answer
    x = 660.25

Related Problems

Find fourth proportional to 370.04, 510.84 and 239.14
Half scale
Find fourth proportional to 1,480.17, 2,043.36 and 956.55
Double scale
Find fourth proportional to 741.09, 1,023.06 and 479.28
Similar ratio
Find fourth proportional to 1,110.13, 1,532.52 and 717.41
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.