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Finding the Fourth Proportional to 12,891.40, 18,091.70 and 12,891.40

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Solution

The fourth proportional to 12,891.40, 18,091.70 and 12,891.40 is: 18,091.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,891.40 : 18,091.70 = 12,891.40 : x
  2. Step 2: Convert to fraction form
    12,891.40/18,091.70 = 12,891.40/x
  3. Step 3: Cross multiply
    12,891.40x = 18,091.70 × 12,891.40
  4. Step 4: Simplify right side
    12,891.40x = 233,227,341.38
  5. Step 5: Solve for x
    x = 233,227,341.38/12,891.40
  6. Step 6: Final answer
    x = 18,091.70

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1.5x scale

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.