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Finding the Fourth Proportional to 7,420.40, 10,243.80 and 5,074.80

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Solution

The fourth proportional to 7,420.40, 10,243.80 and 5,074.80 is: 7,005.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,420.40 : 10,243.80 = 5,074.80 : x
  2. Step 2: Convert to fraction form
    7,420.40/10,243.80 = 5,074.80/x
  3. Step 3: Cross multiply
    7,420.40x = 10,243.80 × 5,074.80
  4. Step 4: Simplify right side
    7,420.40x = 51,985,236.24
  5. Step 5: Solve for x
    x = 51,985,236.24/7,420.40
  6. Step 6: Final answer
    x = 7,005.72

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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.