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Finding the Fourth Proportional to 139,686.60, 192,762.36 and 76,023

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Solution

The fourth proportional to 139,686.60, 192,762.36 and 76,023 is: 104,908.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,686.60 : 192,762.36 = 76,023 : x
  2. Step 2: Convert to fraction form
    139,686.60/192,762.36 = 76,023/x
  3. Step 3: Cross multiply
    139,686.60x = 192,762.36 × 76,023
  4. Step 4: Simplify right side
    139,686.60x = 14,654,372,894.28
  5. Step 5: Solve for x
    x = 14,654,372,894.28/139,686.60
  6. Step 6: Final answer
    x = 104,908.94

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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.