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Finding the Fourth Proportional to 139,898.94, 209,878.40 and 45,134.52

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Solution

The fourth proportional to 139,898.94, 209,878.40 and 45,134.52 is: 67,711.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,898.94 : 209,878.40 = 45,134.52 : x
  2. Step 2: Convert to fraction form
    139,898.94/209,878.40 = 45,134.52/x
  3. Step 3: Cross multiply
    139,898.94x = 209,878.40 × 45,134.52
  4. Step 4: Simplify right side
    139,898.94x = 9,472,760,616.70
  5. Step 5: Solve for x
    x = 9,472,760,616.70/139,898.94
  6. Step 6: Final answer
    x = 67,711.45

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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.