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Finding the Fourth Proportional to 13,128, 18,124.86 and 8,420.46

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Solution

The fourth proportional to 13,128, 18,124.86 and 8,420.46 is: 11,625.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,128 : 18,124.86 = 8,420.46 : x
  2. Step 2: Convert to fraction form
    13,128/18,124.86 = 8,420.46/x
  3. Step 3: Cross multiply
    13,128x = 18,124.86 × 8,420.46
  4. Step 4: Simplify right side
    13,128x = 152,619,658.64
  5. Step 5: Solve for x
    x = 152,619,658.64/13,128
  6. Step 6: Final answer
    x = 11,625.51

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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.