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Finding the Fourth Proportional to 17,888.76, 26,812.50 and 13,138.20

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Solution

The fourth proportional to 17,888.76, 26,812.50 and 13,138.20 is: 19,692.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    17,888.76 : 26,812.50 = 13,138.20 : x
  2. Step 2: Convert to fraction form
    17,888.76/26,812.50 = 13,138.20/x
  3. Step 3: Cross multiply
    17,888.76x = 26,812.50 × 13,138.20
  4. Step 4: Simplify right side
    17,888.76x = 352,267,987.50
  5. Step 5: Solve for x
    x = 352,267,987.50/17,888.76
  6. Step 6: Final answer
    x = 19,692.14

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.