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Finding the Fourth Proportional to 8,914.85, 12,312.90 and 7,128.50

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Solution

The fourth proportional to 8,914.85, 12,312.90 and 7,128.50 is: 9,845.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,914.85 : 12,312.90 = 7,128.50 : x
  2. Step 2: Convert to fraction form
    8,914.85/12,312.90 = 7,128.50/x
  3. Step 3: Cross multiply
    8,914.85x = 12,312.90 × 7,128.50
  4. Step 4: Simplify right side
    8,914.85x = 87,772,446.09
  5. Step 5: Solve for x
    x = 87,772,446.09/8,914.85
  6. Step 6: Final answer
    x = 9,845.65

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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.