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Finding the Fourth Proportional to 18,888.57, 28,344.70 and 11,868.30

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Solution

The fourth proportional to 18,888.57, 28,344.70 and 11,868.30 is: 17,809.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,888.57 : 28,344.70 = 11,868.30 : x
  2. Step 2: Convert to fraction form
    18,888.57/28,344.70 = 11,868.30/x
  3. Step 3: Cross multiply
    18,888.57x = 28,344.70 × 11,868.30
  4. Step 4: Simplify right side
    18,888.57x = 336,403,403.01
  5. Step 5: Solve for x
    x = 336,403,403.01/18,888.57
  6. Step 6: Final answer
    x = 17,809.89

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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.