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Finding the Fourth Proportional to 19,555.71, 27,009.12 and 13,257.15

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Solution

The fourth proportional to 19,555.71, 27,009.12 and 13,257.15 is: 18,309.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,555.71 : 27,009.12 = 13,257.15 : x
  2. Step 2: Convert to fraction form
    19,555.71/27,009.12 = 13,257.15/x
  3. Step 3: Cross multiply
    19,555.71x = 27,009.12 × 13,257.15
  4. Step 4: Simplify right side
    19,555.71x = 358,063,955.21
  5. Step 5: Solve for x
    x = 358,063,955.21/19,555.71
  6. Step 6: Final answer
    x = 18,309.94

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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.