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Finding the Fourth Proportional to 13,328.76, 18,395.30 and 7,739.76

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Solution

The fourth proportional to 13,328.76, 18,395.30 and 7,739.76 is: 10,681.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,328.76 : 18,395.30 = 7,739.76 : x
  2. Step 2: Convert to fraction form
    13,328.76/18,395.30 = 7,739.76/x
  3. Step 3: Cross multiply
    13,328.76x = 18,395.30 × 7,739.76
  4. Step 4: Simplify right side
    13,328.76x = 142,375,207.13
  5. Step 5: Solve for x
    x = 142,375,207.13/13,328.76
  6. Step 6: Final answer
    x = 10,681.80

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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.