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Finding the Fourth Proportional to 13,387.50, 18,474.48 and 7,419.12

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Solution

The fourth proportional to 13,387.50, 18,474.48 and 7,419.12 is: 10,238.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,387.50 : 18,474.48 = 7,419.12 : x
  2. Step 2: Convert to fraction form
    13,387.50/18,474.48 = 7,419.12/x
  3. Step 3: Cross multiply
    13,387.50x = 18,474.48 × 7,419.12
  4. Step 4: Simplify right side
    13,387.50x = 137,064,384.06
  5. Step 5: Solve for x
    x = 137,064,384.06/13,387.50
  6. Step 6: Final answer
    x = 10,238.24

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Half scale
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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.