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Finding the Fourth Proportional to 139,985.70, 210,043.35 and 73,500.90

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Solution

The fourth proportional to 139,985.70, 210,043.35 and 73,500.90 is: 110,285.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,985.70 : 210,043.35 = 73,500.90 : x
  2. Step 2: Convert to fraction form
    139,985.70/210,043.35 = 73,500.90/x
  3. Step 3: Cross multiply
    139,985.70x = 210,043.35 × 73,500.90
  4. Step 4: Simplify right side
    139,985.70x = 15,438,375,264.02
  5. Step 5: Solve for x
    x = 15,438,375,264.02/139,985.70
  6. Step 6: Final answer
    x = 110,285.37

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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.