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Finding the Fourth Proportional to 8,780.54, 12,109.70 and 7,905.74

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Solution

The fourth proportional to 8,780.54, 12,109.70 and 7,905.74 is: 10,903.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,780.54 : 12,109.70 = 7,905.74 : x
  2. Step 2: Convert to fraction form
    8,780.54/12,109.70 = 7,905.74/x
  3. Step 3: Cross multiply
    8,780.54x = 12,109.70 × 7,905.74
  4. Step 4: Simplify right side
    8,780.54x = 95,736,098.89
  5. Step 5: Solve for x
    x = 95,736,098.89/8,780.54
  6. Step 6: Final answer
    x = 10,903.22

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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.