Home / 129,697.91-178,952.64-78,709.50

Finding the Fourth Proportional to 129,697.91, 178,952.64 and 78,709.50

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Solution

The fourth proportional to 129,697.91, 178,952.64 and 78,709.50 is: 108,600.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,697.91 : 178,952.64 = 78,709.50 : x
  2. Step 2: Convert to fraction form
    129,697.91/178,952.64 = 78,709.50/x
  3. Step 3: Cross multiply
    129,697.91x = 178,952.64 × 78,709.50
  4. Step 4: Simplify right side
    129,697.91x = 14,085,272,818.08
  5. Step 5: Solve for x
    x = 14,085,272,818.08/129,697.91
  6. Step 6: Final answer
    x = 108,600.62

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.