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Finding the Fourth Proportional to 8,783.74, 12,129.65 and 5,645.40

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Solution

The fourth proportional to 8,783.74, 12,129.65 and 5,645.40 is: 7,795.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,783.74 : 12,129.65 = 5,645.40 : x
  2. Step 2: Convert to fraction form
    8,783.74/12,129.65 = 5,645.40/x
  3. Step 3: Cross multiply
    8,783.74x = 12,129.65 × 5,645.40
  4. Step 4: Simplify right side
    8,783.74x = 68,476,726.11
  5. Step 5: Solve for x
    x = 68,476,726.11/8,783.74
  6. Step 6: Final answer
    x = 7,795.85

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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.