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Finding the Fourth Proportional to 7,421.40, 11,115.90 and 7,259.40

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Solution

The fourth proportional to 7,421.40, 11,115.90 and 7,259.40 is: 10,873.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,421.40 : 11,115.90 = 7,259.40 : x
  2. Step 2: Convert to fraction form
    7,421.40/11,115.90 = 7,259.40/x
  3. Step 3: Cross multiply
    7,421.40x = 11,115.90 × 7,259.40
  4. Step 4: Simplify right side
    7,421.40x = 80,694,764.46
  5. Step 5: Solve for x
    x = 80,694,764.46/7,421.40
  6. Step 6: Final answer
    x = 10,873.25

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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.