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Finding the Fourth Proportional to 8,985.68, 13,411.99 and 8,431.64

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Solution

The fourth proportional to 8,985.68, 13,411.99 and 8,431.64 is: 12,585.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,985.68 : 13,411.99 = 8,431.64 : x
  2. Step 2: Convert to fraction form
    8,985.68/13,411.99 = 8,431.64/x
  3. Step 3: Cross multiply
    8,985.68x = 13,411.99 × 8,431.64
  4. Step 4: Simplify right side
    8,985.68x = 113,084,983.22
  5. Step 5: Solve for x
    x = 113,084,983.22/8,985.68
  6. Step 6: Final answer
    x = 12,585.03

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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.