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Finding the Fourth Proportional to 139,347.81, 192,302.51 and 78,918.21

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Solution

The fourth proportional to 139,347.81, 192,302.51 and 78,918.21 is: 108,908.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,347.81 : 192,302.51 = 78,918.21 : x
  2. Step 2: Convert to fraction form
    139,347.81/192,302.51 = 78,918.21/x
  3. Step 3: Cross multiply
    139,347.81x = 192,302.51 × 78,918.21
  4. Step 4: Simplify right side
    139,347.81x = 15,176,169,473.12
  5. Step 5: Solve for x
    x = 15,176,169,473.12/139,347.81
  6. Step 6: Final answer
    x = 108,908.56

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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.