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Finding the Fourth Proportional to 120,870.10, 181,305.15 and 78,879.70

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Solution

The fourth proportional to 120,870.10, 181,305.15 and 78,879.70 is: 118,319.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    120,870.10 : 181,305.15 = 78,879.70 : x
  2. Step 2: Convert to fraction form
    120,870.10/181,305.15 = 78,879.70/x
  3. Step 3: Cross multiply
    120,870.10x = 181,305.15 × 78,879.70
  4. Step 4: Simplify right side
    120,870.10x = 14,301,295,840.46
  5. Step 5: Solve for x
    x = 14,301,295,840.46/120,870.10
  6. Step 6: Final answer
    x = 118,319.55

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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.