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Finding the Fourth Proportional to 28,688.70, 43,035.70 and 11,159.86

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Solution

The fourth proportional to 28,688.70, 43,035.70 and 11,159.86 is: 16,740.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,688.70 : 43,035.70 = 11,159.86 : x
  2. Step 2: Convert to fraction form
    28,688.70/43,035.70 = 11,159.86/x
  3. Step 3: Cross multiply
    28,688.70x = 43,035.70 × 11,159.86
  4. Step 4: Simplify right side
    28,688.70x = 480,272,387.00
  5. Step 5: Solve for x
    x = 480,272,387.00/28,688.70
  6. Step 6: Final answer
    x = 16,740.82

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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.