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Finding the Fourth Proportional to 139,820.64, 192,957.12 and 79,393.92

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Solution

The fourth proportional to 139,820.64, 192,957.12 and 79,393.92 is: 109,566.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,820.64 : 192,957.12 = 79,393.92 : x
  2. Step 2: Convert to fraction form
    139,820.64/192,957.12 = 79,393.92/x
  3. Step 3: Cross multiply
    139,820.64x = 192,957.12 × 79,393.92
  4. Step 4: Simplify right side
    139,820.64x = 15,319,622,148.71
  5. Step 5: Solve for x
    x = 15,319,622,148.71/139,820.64
  6. Step 6: Final answer
    x = 109,566.24

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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.