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Finding the Fourth Proportional to 19,661.61, 29,494.12 and 5,430.09

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Solution

The fourth proportional to 19,661.61, 29,494.12 and 5,430.09 is: 8,145.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,661.61 : 29,494.12 = 5,430.09 : x
  2. Step 2: Convert to fraction form
    19,661.61/29,494.12 = 5,430.09/x
  3. Step 3: Cross multiply
    19,661.61x = 29,494.12 × 5,430.09
  4. Step 4: Simplify right side
    19,661.61x = 160,155,861.65
  5. Step 5: Solve for x
    x = 160,155,861.65/19,661.61
  6. Step 6: Final answer
    x = 8,145.61

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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.