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Finding the Fourth Proportional to 139,013.55, 208,520.28 and 120,237.77

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Solution

The fourth proportional to 139,013.55, 208,520.28 and 120,237.77 is: 180,356.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,013.55 : 208,520.28 = 120,237.77 : x
  2. Step 2: Convert to fraction form
    139,013.55/208,520.28 = 120,237.77/x
  3. Step 3: Cross multiply
    139,013.55x = 208,520.28 × 120,237.77
  4. Step 4: Simplify right side
    139,013.55x = 25,072,013,988.28
  5. Step 5: Solve for x
    x = 25,072,013,988.28/139,013.55
  6. Step 6: Final answer
    x = 180,356.62

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1.5x scale

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.