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Finding the Fourth Proportional to 120,663.34, 180,699.62 and 85,037.10

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Solution

The fourth proportional to 120,663.34, 180,699.62 and 85,037.10 is: 127,347.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    120,663.34 : 180,699.62 = 85,037.10 : x
  2. Step 2: Convert to fraction form
    120,663.34/180,699.62 = 85,037.10/x
  3. Step 3: Cross multiply
    120,663.34x = 180,699.62 × 85,037.10
  4. Step 4: Simplify right side
    120,663.34x = 15,366,171,655.90
  5. Step 5: Solve for x
    x = 15,366,171,655.90/120,663.34
  6. Step 6: Final answer
    x = 127,347.47

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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.