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Finding the Fourth Proportional to 18,411.76, 25,408.88 and 12,747.68

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Solution

The fourth proportional to 18,411.76, 25,408.88 and 12,747.68 is: 17,592.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,411.76 : 25,408.88 = 12,747.68 : x
  2. Step 2: Convert to fraction form
    18,411.76/25,408.88 = 12,747.68/x
  3. Step 3: Cross multiply
    18,411.76x = 25,408.88 × 12,747.68
  4. Step 4: Simplify right side
    18,411.76x = 323,904,271.40
  5. Step 5: Solve for x
    x = 323,904,271.40/18,411.76
  6. Step 6: Final answer
    x = 17,592.25

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.