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Finding the Fourth Proportional to 18,412.90, 25,390.72 and 13,032.88

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Solution

The fourth proportional to 18,412.90, 25,390.72 and 13,032.88 is: 17,971.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,412.90 : 25,390.72 = 13,032.88 : x
  2. Step 2: Convert to fraction form
    18,412.90/25,390.72 = 13,032.88/x
  3. Step 3: Cross multiply
    18,412.90x = 25,390.72 × 13,032.88
  4. Step 4: Simplify right side
    18,412.90x = 330,914,206.87
  5. Step 5: Solve for x
    x = 330,914,206.87/18,412.90
  6. Step 6: Final answer
    x = 17,971.87

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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.