Home / 284.63-423.87-278.55

Finding the Fourth Proportional to 284.63, 423.87 and 278.55

Calculator

Solution

The fourth proportional to 284.63, 423.87 and 278.55 is: 414.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    284.63 : 423.87 = 278.55 : x
  2. Step 2: Convert to fraction form
    284.63/423.87 = 278.55/x
  3. Step 3: Cross multiply
    284.63x = 423.87 × 278.55
  4. Step 4: Simplify right side
    284.63x = 118,068.99
  5. Step 5: Solve for x
    x = 118,068.99/284.63
  6. Step 6: Final answer
    x = 414.82

Related Problems

Find fourth proportional to 142.31, 211.94 and 139.28
Half scale
Find fourth proportional to 569.25, 847.74 and 557.10
Double scale
Find fourth proportional to 285.63, 425.36 and 279.55
Similar ratio
Find fourth proportional to 426.94, 635.81 and 417.83
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.