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Finding the Fourth Proportional to 13,287.72, 18,336.84 and 7,913.92

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Solution

The fourth proportional to 13,287.72, 18,336.84 and 7,913.92 is: 10,921.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,287.72 : 18,336.84 = 7,913.92 : x
  2. Step 2: Convert to fraction form
    13,287.72/18,336.84 = 7,913.92/x
  3. Step 3: Cross multiply
    13,287.72x = 18,336.84 × 7,913.92
  4. Step 4: Simplify right side
    13,287.72x = 145,116,284.81
  5. Step 5: Solve for x
    x = 145,116,284.81/13,287.72
  6. Step 6: Final answer
    x = 10,921.08

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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.