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Finding the Fourth Proportional to 13,720.88, 18,935.63 and 7,752.39

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Solution

The fourth proportional to 13,720.88, 18,935.63 and 7,752.39 is: 10,698.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,720.88 : 18,935.63 = 7,752.39 : x
  2. Step 2: Convert to fraction form
    13,720.88/18,935.63 = 7,752.39/x
  3. Step 3: Cross multiply
    13,720.88x = 18,935.63 × 7,752.39
  4. Step 4: Simplify right side
    13,720.88x = 146,796,349.89
  5. Step 5: Solve for x
    x = 146,796,349.89/13,720.88
  6. Step 6: Final answer
    x = 10,698.76

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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.