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Finding the Fourth Proportional to 9,355.65, 12,911.22 and 5,378.01

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Solution

The fourth proportional to 9,355.65, 12,911.22 and 5,378.01 is: 7,421.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,355.65 : 12,911.22 = 5,378.01 : x
  2. Step 2: Convert to fraction form
    9,355.65/12,911.22 = 5,378.01/x
  3. Step 3: Cross multiply
    9,355.65x = 12,911.22 × 5,378.01
  4. Step 4: Simplify right side
    9,355.65x = 69,436,670.27
  5. Step 5: Solve for x
    x = 69,436,670.27/9,355.65
  6. Step 6: Final answer
    x = 7,421.90

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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.