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Finding the Fourth Proportional to 28,702.80, 42,993.72 and 13,133.52

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Solution

The fourth proportional to 28,702.80, 42,993.72 and 13,133.52 is: 19,672.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,702.80 : 42,993.72 = 13,133.52 : x
  2. Step 2: Convert to fraction form
    28,702.80/42,993.72 = 13,133.52/x
  3. Step 3: Cross multiply
    28,702.80x = 42,993.72 × 13,133.52
  4. Step 4: Simplify right side
    28,702.80x = 564,658,881.49
  5. Step 5: Solve for x
    x = 564,658,881.49/28,702.80
  6. Step 6: Final answer
    x = 19,672.61

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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.