Home / 4,287.20-6,430.80-2,638.40

Finding the Fourth Proportional to 4,287.20, 6,430.80 and 2,638.40

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Solution

The fourth proportional to 4,287.20, 6,430.80 and 2,638.40 is: 3,957.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    4,287.20 : 6,430.80 = 2,638.40 : x
  2. Step 2: Convert to fraction form
    4,287.20/6,430.80 = 2,638.40/x
  3. Step 3: Cross multiply
    4,287.20x = 6,430.80 × 2,638.40
  4. Step 4: Simplify right side
    4,287.20x = 16,967,022.72
  5. Step 5: Solve for x
    x = 16,967,022.72/4,287.20
  6. Step 6: Final answer
    x = 3,957.60

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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.