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Finding the Fourth Proportional to 139,898.40, 209,896.20 and 61,069.20

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Solution

The fourth proportional to 139,898.40, 209,896.20 and 61,069.20 is: 91,625.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,898.40 : 209,896.20 = 61,069.20 : x
  2. Step 2: Convert to fraction form
    139,898.40/209,896.20 = 61,069.20/x
  3. Step 3: Cross multiply
    139,898.40x = 209,896.20 × 61,069.20
  4. Step 4: Simplify right side
    139,898.40x = 12,818,193,017.04
  5. Step 5: Solve for x
    x = 12,818,193,017.04/139,898.40
  6. Step 6: Final answer
    x = 91,625.02

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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.