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Finding the Fourth Proportional to 9,905.40, 14,841.90 and 8,447.40

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Solution

The fourth proportional to 9,905.40, 14,841.90 and 8,447.40 is: 12,657.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,905.40 : 14,841.90 = 8,447.40 : x
  2. Step 2: Convert to fraction form
    9,905.40/14,841.90 = 8,447.40/x
  3. Step 3: Cross multiply
    9,905.40x = 14,841.90 × 8,447.40
  4. Step 4: Simplify right side
    9,905.40x = 125,375,466.06
  5. Step 5: Solve for x
    x = 125,375,466.06/9,905.40
  6. Step 6: Final answer
    x = 12,657.28

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.