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Finding the Fourth Proportional to 13,379.93, 19,988.51 and 8,661.50

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Solution

The fourth proportional to 13,379.93, 19,988.51 and 8,661.50 is: 12,939.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,379.93 : 19,988.51 = 8,661.50 : x
  2. Step 2: Convert to fraction form
    13,379.93/19,988.51 = 8,661.50/x
  3. Step 3: Cross multiply
    13,379.93x = 19,988.51 × 8,661.50
  4. Step 4: Simplify right side
    13,379.93x = 173,130,379.42
  5. Step 5: Solve for x
    x = 173,130,379.42/13,379.93
  6. Step 6: Final answer
    x = 12,939.56

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.