Home / 4,280.40-6,420.60-3,420.18

Finding the Fourth Proportional to 4,280.40, 6,420.60 and 3,420.18

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Solution

The fourth proportional to 4,280.40, 6,420.60 and 3,420.18 is: 5,130.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    4,280.40 : 6,420.60 = 3,420.18 : x
  2. Step 2: Convert to fraction form
    4,280.40/6,420.60 = 3,420.18/x
  3. Step 3: Cross multiply
    4,280.40x = 6,420.60 × 3,420.18
  4. Step 4: Simplify right side
    4,280.40x = 21,959,607.71
  5. Step 5: Solve for x
    x = 21,959,607.71/4,280.40
  6. Step 6: Final answer
    x = 5,130.27

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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.