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Finding the Fourth Proportional to 78,959.18, 108,912.75 and 47,103.50

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Solution

The fourth proportional to 78,959.18, 108,912.75 and 47,103.50 is: 64,972.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,959.18 : 108,912.75 = 47,103.50 : x
  2. Step 2: Convert to fraction form
    78,959.18/108,912.75 = 47,103.50/x
  3. Step 3: Cross multiply
    78,959.18x = 108,912.75 × 47,103.50
  4. Step 4: Simplify right side
    78,959.18x = 5,130,171,719.63
  5. Step 5: Solve for x
    x = 5,130,171,719.63/78,959.18
  6. Step 6: Final answer
    x = 64,972.45

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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.