Home / 129,678.85-178,957.59-72,321.79

Finding the Fourth Proportional to 129,678.85, 178,957.59 and 72,321.79

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Solution

The fourth proportional to 129,678.85, 178,957.59 and 72,321.79 is: 99,804.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,678.85 : 178,957.59 = 72,321.79 : x
  2. Step 2: Convert to fraction form
    129,678.85/178,957.59 = 72,321.79/x
  3. Step 3: Cross multiply
    129,678.85x = 178,957.59 × 72,321.79
  4. Step 4: Simplify right side
    129,678.85x = 12,942,533,242.89
  5. Step 5: Solve for x
    x = 12,942,533,242.89/129,678.85
  6. Step 6: Final answer
    x = 99,804.50

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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.