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Finding the Fourth Proportional to 13,315.76, 18,375.66 and 7,347.68

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Solution

The fourth proportional to 13,315.76, 18,375.66 and 7,347.68 is: 10,139.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,315.76 : 18,375.66 = 7,347.68 : x
  2. Step 2: Convert to fraction form
    13,315.76/18,375.66 = 7,347.68/x
  3. Step 3: Cross multiply
    13,315.76x = 18,375.66 × 7,347.68
  4. Step 4: Simplify right side
    13,315.76x = 135,018,469.47
  5. Step 5: Solve for x
    x = 135,018,469.47/13,315.76
  6. Step 6: Final answer
    x = 10,139.75

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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.