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Finding the Fourth Proportional to 18,503.81, 25,535.87 and 10,120.31

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Solution

The fourth proportional to 18,503.81, 25,535.87 and 10,120.31 is: 13,966.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,503.81 : 25,535.87 = 10,120.31 : x
  2. Step 2: Convert to fraction form
    18,503.81/25,535.87 = 10,120.31/x
  3. Step 3: Cross multiply
    18,503.81x = 25,535.87 × 10,120.31
  4. Step 4: Simplify right side
    18,503.81x = 258,430,971.71
  5. Step 5: Solve for x
    x = 258,430,971.71/18,503.81
  6. Step 6: Final answer
    x = 13,966.36

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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.