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Finding the Fourth Proportional to 12,689.40, 19,029.90 and 4,369.20

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Solution

The fourth proportional to 12,689.40, 19,029.90 and 4,369.20 is: 6,552.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,689.40 : 19,029.90 = 4,369.20 : x
  2. Step 2: Convert to fraction form
    12,689.40/19,029.90 = 4,369.20/x
  3. Step 3: Cross multiply
    12,689.40x = 19,029.90 × 4,369.20
  4. Step 4: Simplify right side
    12,689.40x = 83,145,439.08
  5. Step 5: Solve for x
    x = 83,145,439.08/12,689.40
  6. Step 6: Final answer
    x = 6,552.35

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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.