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Finding the Fourth Proportional to 12,884.40, 18,090 and 12,884.40

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Solution

The fourth proportional to 12,884.40, 18,090 and 12,884.40 is: 18,090

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,884.40 : 18,090 = 12,884.40 : x
  2. Step 2: Convert to fraction form
    12,884.40/18,090 = 12,884.40/x
  3. Step 3: Cross multiply
    12,884.40x = 18,090 × 12,884.40
  4. Step 4: Simplify right side
    12,884.40x = 233,078,796
  5. Step 5: Solve for x
    x = 233,078,796/12,884.40
  6. Step 6: Final answer
    x = 18,090

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Why These Related Problems?

These problems maintain the same ratio (1.40) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.