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Finding the Fourth Proportional to 12,700.86, 18,966.90 and 12,563.61

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Solution

The fourth proportional to 12,700.86, 18,966.90 and 12,563.61 is: 18,761.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,700.86 : 18,966.90 = 12,563.61 : x
  2. Step 2: Convert to fraction form
    12,700.86/18,966.90 = 12,563.61/x
  3. Step 3: Cross multiply
    12,700.86x = 18,966.90 × 12,563.61
  4. Step 4: Simplify right side
    12,700.86x = 238,292,734.51
  5. Step 5: Solve for x
    x = 238,292,734.51/12,700.86
  6. Step 6: Final answer
    x = 18,761.94

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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.