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Finding the Fourth Proportional to 28,719.31, 43,078.98 and 8,999.40

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Solution

The fourth proportional to 28,719.31, 43,078.98 and 8,999.40 is: 13,499.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,719.31 : 43,078.98 = 8,999.40 : x
  2. Step 2: Convert to fraction form
    28,719.31/43,078.98 = 8,999.40/x
  3. Step 3: Cross multiply
    28,719.31x = 43,078.98 × 8,999.40
  4. Step 4: Simplify right side
    28,719.31x = 387,684,972.61
  5. Step 5: Solve for x
    x = 387,684,972.61/28,719.31
  6. Step 6: Final answer
    x = 13,499.11

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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.