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Finding the Fourth Proportional to 6,890.94, 9,509.32 and 4,020.21

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Solution

The fourth proportional to 6,890.94, 9,509.32 and 4,020.21 is: 5,547.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,890.94 : 9,509.32 = 4,020.21 : x
  2. Step 2: Convert to fraction form
    6,890.94/9,509.32 = 4,020.21/x
  3. Step 3: Cross multiply
    6,890.94x = 9,509.32 × 4,020.21
  4. Step 4: Simplify right side
    6,890.94x = 38,229,487.13
  5. Step 5: Solve for x
    x = 38,229,487.13/6,890.94
  6. Step 6: Final answer
    x = 5,547.79

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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.