Home / 10,420.80-15,638.40-7,501.60

Finding the Fourth Proportional to 10,420.80, 15,638.40 and 7,501.60

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Solution

The fourth proportional to 10,420.80, 15,638.40 and 7,501.60 is: 11,257.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    10,420.80 : 15,638.40 = 7,501.60 : x
  2. Step 2: Convert to fraction form
    10,420.80/15,638.40 = 7,501.60/x
  3. Step 3: Cross multiply
    10,420.80x = 15,638.40 × 7,501.60
  4. Step 4: Simplify right side
    10,420.80x = 117,313,021.44
  5. Step 5: Solve for x
    x = 117,313,021.44/10,420.80
  6. Step 6: Final answer
    x = 11,257.58

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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.