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Finding the Fourth Proportional to 28,988.64, 43,485.84 and 7,929.95

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Solution

The fourth proportional to 28,988.64, 43,485.84 and 7,929.95 is: 11,895.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,988.64 : 43,485.84 = 7,929.95 : x
  2. Step 2: Convert to fraction form
    28,988.64/43,485.84 = 7,929.95/x
  3. Step 3: Cross multiply
    28,988.64x = 43,485.84 × 7,929.95
  4. Step 4: Simplify right side
    28,988.64x = 344,840,319.48
  5. Step 5: Solve for x
    x = 344,840,319.48/28,988.64
  6. Step 6: Final answer
    x = 11,895.71

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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.