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Finding the Fourth Proportional to 7,421.74, 10,243.56 and 7,187.56

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Solution

The fourth proportional to 7,421.74, 10,243.56 and 7,187.56 is: 9,920.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,421.74 : 10,243.56 = 7,187.56 : x
  2. Step 2: Convert to fraction form
    7,421.74/10,243.56 = 7,187.56/x
  3. Step 3: Cross multiply
    7,421.74x = 10,243.56 × 7,187.56
  4. Step 4: Simplify right side
    7,421.74x = 73,626,202.11
  5. Step 5: Solve for x
    x = 73,626,202.11/7,421.74
  6. Step 6: Final answer
    x = 9,920.34

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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.