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Finding the Fourth Proportional to 121,319.10, 181,978.65 and 79,328.70

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Solution

The fourth proportional to 121,319.10, 181,978.65 and 79,328.70 is: 118,993.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,319.10 : 181,978.65 = 79,328.70 : x
  2. Step 2: Convert to fraction form
    121,319.10/181,978.65 = 79,328.70/x
  3. Step 3: Cross multiply
    121,319.10x = 181,978.65 × 79,328.70
  4. Step 4: Simplify right side
    121,319.10x = 14,436,129,732.26
  5. Step 5: Solve for x
    x = 14,436,129,732.26/121,319.10
  6. Step 6: Final answer
    x = 118,993.05

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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.