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Finding the Fourth Proportional to 139,341.81, 192,291.75 and 78,912.47

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Solution

The fourth proportional to 139,341.81, 192,291.75 and 78,912.47 is: 108,899.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,341.81 : 192,291.75 = 78,912.47 : x
  2. Step 2: Convert to fraction form
    139,341.81/192,291.75 = 78,912.47/x
  3. Step 3: Cross multiply
    139,341.81x = 192,291.75 × 78,912.47
  4. Step 4: Simplify right side
    139,341.81x = 15,174,216,953.12
  5. Step 5: Solve for x
    x = 15,174,216,953.12/139,341.81
  6. Step 6: Final answer
    x = 108,899.24

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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.