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Finding the Fourth Proportional to 139,313.40, 192,248.94 and 78,898.89

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Solution

The fourth proportional to 139,313.40, 192,248.94 and 78,898.89 is: 108,878.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,313.40 : 192,248.94 = 78,898.89 : x
  2. Step 2: Convert to fraction form
    139,313.40/192,248.94 = 78,898.89/x
  3. Step 3: Cross multiply
    139,313.40x = 192,248.94 × 78,898.89
  4. Step 4: Simplify right side
    139,313.40x = 15,168,227,969.68
  5. Step 5: Solve for x
    x = 15,168,227,969.68/139,313.40
  6. Step 6: Final answer
    x = 108,878.46

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.