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Finding the Fourth Proportional to 120,980.10, 181,506.60 and 85,988.10

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Solution

The fourth proportional to 120,980.10, 181,506.60 and 85,988.10 is: 129,008.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    120,980.10 : 181,506.60 = 85,988.10 : x
  2. Step 2: Convert to fraction form
    120,980.10/181,506.60 = 85,988.10/x
  3. Step 3: Cross multiply
    120,980.10x = 181,506.60 × 85,988.10
  4. Step 4: Simplify right side
    120,980.10x = 15,607,407,671.46
  5. Step 5: Solve for x
    x = 15,607,407,671.46/120,980.10
  6. Step 6: Final answer
    x = 129,008.06

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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.