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Finding the Fourth Proportional to 28,689.80, 43,018.14 and 11,139.14

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Solution

The fourth proportional to 28,689.80, 43,018.14 and 11,139.14 is: 16,702.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,689.80 : 43,018.14 = 11,139.14 : x
  2. Step 2: Convert to fraction form
    28,689.80/43,018.14 = 11,139.14/x
  3. Step 3: Cross multiply
    28,689.80x = 43,018.14 × 11,139.14
  4. Step 4: Simplify right side
    28,689.80x = 479,185,084.00
  5. Step 5: Solve for x
    x = 479,185,084.00/28,689.80
  6. Step 6: Final answer
    x = 16,702.28

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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.