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Finding the Fourth Proportional to 13,393.64, 18,483.96 and 7,728.40

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Solution

The fourth proportional to 13,393.64, 18,483.96 and 7,728.40 is: 10,665.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,393.64 : 18,483.96 = 7,728.40 : x
  2. Step 2: Convert to fraction form
    13,393.64/18,483.96 = 7,728.40/x
  3. Step 3: Cross multiply
    13,393.64x = 18,483.96 × 7,728.40
  4. Step 4: Simplify right side
    13,393.64x = 142,851,436.46
  5. Step 5: Solve for x
    x = 142,851,436.46/13,393.64
  6. Step 6: Final answer
    x = 10,665.62

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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.