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Finding the Fourth Proportional to 78,628.64, 117,665.96 and 49,060.40

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Solution

The fourth proportional to 78,628.64, 117,665.96 and 49,060.40 is: 73,417.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,628.64 : 117,665.96 = 49,060.40 : x
  2. Step 2: Convert to fraction form
    78,628.64/117,665.96 = 49,060.40/x
  3. Step 3: Cross multiply
    78,628.64x = 117,665.96 × 49,060.40
  4. Step 4: Simplify right side
    78,628.64x = 5,772,739,063.98
  5. Step 5: Solve for x
    x = 5,772,739,063.98/78,628.64
  6. Step 6: Final answer
    x = 73,417.77

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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.