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Finding the Fourth Proportional to 43,321.79, 64,984.98 and 12,159.47

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Solution

The fourth proportional to 43,321.79, 64,984.98 and 12,159.47 is: 18,239.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    43,321.79 : 64,984.98 = 12,159.47 : x
  2. Step 2: Convert to fraction form
    43,321.79/64,984.98 = 12,159.47/x
  3. Step 3: Cross multiply
    43,321.79x = 64,984.98 × 12,159.47
  4. Step 4: Simplify right side
    43,321.79x = 790,182,914.76
  5. Step 5: Solve for x
    x = 790,182,914.76/43,321.79
  6. Step 6: Final answer
    x = 18,239.85

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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.