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Finding the Fourth Proportional to 13,218, 18,240.84 and 7,913.58

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Solution

The fourth proportional to 13,218, 18,240.84 and 7,913.58 is: 10,920.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,218 : 18,240.84 = 7,913.58 : x
  2. Step 2: Convert to fraction form
    13,218/18,240.84 = 7,913.58/x
  3. Step 3: Cross multiply
    13,218x = 18,240.84 × 7,913.58
  4. Step 4: Simplify right side
    13,218x = 144,350,346.61
  5. Step 5: Solve for x
    x = 144,350,346.61/13,218
  6. Step 6: Final answer
    x = 10,920.74

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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.