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Finding the Fourth Proportional to 18,867.20, 28,239.20 and 13,006.08

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Solution

The fourth proportional to 18,867.20, 28,239.20 and 13,006.08 is: 19,466.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,867.20 : 28,239.20 = 13,006.08 : x
  2. Step 2: Convert to fraction form
    18,867.20/28,239.20 = 13,006.08/x
  3. Step 3: Cross multiply
    18,867.20x = 28,239.20 × 13,006.08
  4. Step 4: Simplify right side
    18,867.20x = 367,281,294.34
  5. Step 5: Solve for x
    x = 367,281,294.34/18,867.20
  6. Step 6: Final answer
    x = 19,466.66

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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.