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Finding the Fourth Proportional to 8,661.64, 12,985.48 and 7,969.70

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Solution

The fourth proportional to 8,661.64, 12,985.48 and 7,969.70 is: 11,948.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,661.64 : 12,985.48 = 7,969.70 : x
  2. Step 2: Convert to fraction form
    8,661.64/12,985.48 = 7,969.70/x
  3. Step 3: Cross multiply
    8,661.64x = 12,985.48 × 7,969.70
  4. Step 4: Simplify right side
    8,661.64x = 103,490,379.96
  5. Step 5: Solve for x
    x = 103,490,379.96/8,661.64
  6. Step 6: Final answer
    x = 11,948.13

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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.