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Finding the Fourth Proportional to 13,555.81, 18,707.54 and 7,506.82

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Solution

The fourth proportional to 13,555.81, 18,707.54 and 7,506.82 is: 10,359.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,555.81 : 18,707.54 = 7,506.82 : x
  2. Step 2: Convert to fraction form
    13,555.81/18,707.54 = 7,506.82/x
  3. Step 3: Cross multiply
    13,555.81x = 18,707.54 × 7,506.82
  4. Step 4: Simplify right side
    13,555.81x = 140,434,135.42
  5. Step 5: Solve for x
    x = 140,434,135.42/13,555.81
  6. Step 6: Final answer
    x = 10,359.70

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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.