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Finding the Fourth Proportional to 8,641.12, 12,905 and 8,550.40

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Solution

The fourth proportional to 8,641.12, 12,905 and 8,550.40 is: 12,769.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,641.12 : 12,905 = 8,550.40 : x
  2. Step 2: Convert to fraction form
    8,641.12/12,905 = 8,550.40/x
  3. Step 3: Cross multiply
    8,641.12x = 12,905 × 8,550.40
  4. Step 4: Simplify right side
    8,641.12x = 110,342,912
  5. Step 5: Solve for x
    x = 110,342,912/8,641.12
  6. Step 6: Final answer
    x = 12,769.52

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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.