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Finding the Fourth Proportional to 119,810.20, 179,628.90 and 78,280.60

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Solution

The fourth proportional to 119,810.20, 179,628.90 and 78,280.60 is: 117,364.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    119,810.20 : 179,628.90 = 78,280.60 : x
  2. Step 2: Convert to fraction form
    119,810.20/179,628.90 = 78,280.60/x
  3. Step 3: Cross multiply
    119,810.20x = 179,628.90 × 78,280.60
  4. Step 4: Simplify right side
    119,810.20x = 14,061,458,069.34
  5. Step 5: Solve for x
    x = 14,061,458,069.34/119,810.20
  6. Step 6: Final answer
    x = 117,364.45

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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.