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Finding the Fourth Proportional to 19,989.76, 29,986.08 and 5,757.65

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Solution

The fourth proportional to 19,989.76, 29,986.08 and 5,757.65 is: 8,636.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,989.76 : 29,986.08 = 5,757.65 : x
  2. Step 2: Convert to fraction form
    19,989.76/29,986.08 = 5,757.65/x
  3. Step 3: Cross multiply
    19,989.76x = 29,986.08 × 5,757.65
  4. Step 4: Simplify right side
    19,989.76x = 172,649,353.51
  5. Step 5: Solve for x
    x = 172,649,353.51/19,989.76
  6. Step 6: Final answer
    x = 8,636.89

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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.