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Finding the Fourth Proportional to 13,389.90, 18,478.18 and 7,421.64

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Solution

The fourth proportional to 13,389.90, 18,478.18 and 7,421.64 is: 10,241.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,389.90 : 18,478.18 = 7,421.64 : x
  2. Step 2: Convert to fraction form
    13,389.90/18,478.18 = 7,421.64/x
  3. Step 3: Cross multiply
    13,389.90x = 18,478.18 × 7,421.64
  4. Step 4: Simplify right side
    13,389.90x = 137,138,399.82
  5. Step 5: Solve for x
    x = 137,138,399.82/13,389.90
  6. Step 6: Final answer
    x = 10,241.93

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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.