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Finding the Fourth Proportional to 19,266.40, 28,867.20 and 12,689.20

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Solution

The fourth proportional to 19,266.40, 28,867.20 and 12,689.20 is: 19,012.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,266.40 : 28,867.20 = 12,689.20 : x
  2. Step 2: Convert to fraction form
    19,266.40/28,867.20 = 12,689.20/x
  3. Step 3: Cross multiply
    19,266.40x = 28,867.20 × 12,689.20
  4. Step 4: Simplify right side
    19,266.40x = 366,301,674.24
  5. Step 5: Solve for x
    x = 366,301,674.24/19,266.40
  6. Step 6: Final answer
    x = 19,012.46

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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.