Home / 12,638.40-18,957.60-5,240.40

Finding the Fourth Proportional to 12,638.40, 18,957.60 and 5,240.40

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Solution

The fourth proportional to 12,638.40, 18,957.60 and 5,240.40 is: 7,860.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,638.40 : 18,957.60 = 5,240.40 : x
  2. Step 2: Convert to fraction form
    12,638.40/18,957.60 = 5,240.40/x
  3. Step 3: Cross multiply
    12,638.40x = 18,957.60 × 5,240.40
  4. Step 4: Simplify right side
    12,638.40x = 99,345,407.04
  5. Step 5: Solve for x
    x = 99,345,407.04/12,638.40
  6. Step 6: Final answer
    x = 7,860.60

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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.