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Finding the Fourth Proportional to 7,478.40, 11,201.40 and 7,316.40

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Solution

The fourth proportional to 7,478.40, 11,201.40 and 7,316.40 is: 10,958.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,478.40 : 11,201.40 = 7,316.40 : x
  2. Step 2: Convert to fraction form
    7,478.40/11,201.40 = 7,316.40/x
  3. Step 3: Cross multiply
    7,478.40x = 11,201.40 × 7,316.40
  4. Step 4: Simplify right side
    7,478.40x = 81,953,922.96
  5. Step 5: Solve for x
    x = 81,953,922.96/7,478.40
  6. Step 6: Final answer
    x = 10,958.75

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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.