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Finding the Fourth Proportional to 13,554.62, 18,720 and 9,316.88

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Solution

The fourth proportional to 13,554.62, 18,720 and 9,316.88 is: 12,867.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,554.62 : 18,720 = 9,316.88 : x
  2. Step 2: Convert to fraction form
    13,554.62/18,720 = 9,316.88/x
  3. Step 3: Cross multiply
    13,554.62x = 18,720 × 9,316.88
  4. Step 4: Simplify right side
    13,554.62x = 174,411,993.60
  5. Step 5: Solve for x
    x = 174,411,993.60/13,554.62
  6. Step 6: Final answer
    x = 12,867.35

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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.