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Finding the Fourth Proportional to 139,875.70, 209,813.55 and 120,848.80

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Solution

The fourth proportional to 139,875.70, 209,813.55 and 120,848.80 is: 181,273.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,875.70 : 209,813.55 = 120,848.80 : x
  2. Step 2: Convert to fraction form
    139,875.70/209,813.55 = 120,848.80/x
  3. Step 3: Cross multiply
    139,875.70x = 209,813.55 × 120,848.80
  4. Step 4: Simplify right side
    139,875.70x = 25,355,715,741.24
  5. Step 5: Solve for x
    x = 25,355,715,741.24/139,875.70
  6. Step 6: Final answer
    x = 181,273.20

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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.