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Finding the Fourth Proportional to 13,698.51, 18,903.93 and 7,731.45

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Solution

The fourth proportional to 13,698.51, 18,903.93 and 7,731.45 is: 10,669.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,698.51 : 18,903.93 = 7,731.45 : x
  2. Step 2: Convert to fraction form
    13,698.51/18,903.93 = 7,731.45/x
  3. Step 3: Cross multiply
    13,698.51x = 18,903.93 × 7,731.45
  4. Step 4: Simplify right side
    13,698.51x = 146,154,789.60
  5. Step 5: Solve for x
    x = 146,154,789.60/13,698.51
  6. Step 6: Final answer
    x = 10,669.39

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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.