Home / 6,420.12-8,860.78-3,903.02

Finding the Fourth Proportional to 6,420.12, 8,860.78 and 3,903.02

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Solution

The fourth proportional to 6,420.12, 8,860.78 and 3,903.02 is: 5,386.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,420.12 : 8,860.78 = 3,903.02 : x
  2. Step 2: Convert to fraction form
    6,420.12/8,860.78 = 3,903.02/x
  3. Step 3: Cross multiply
    6,420.12x = 8,860.78 × 3,903.02
  4. Step 4: Simplify right side
    6,420.12x = 34,583,737.74
  5. Step 5: Solve for x
    x = 34,583,737.74/6,420.12
  6. Step 6: Final answer
    x = 5,386.78

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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.