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Finding the Fourth Proportional to 123,833.32, 170,890.65 and 70,128.79

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Solution

The fourth proportional to 123,833.32, 170,890.65 and 70,128.79 is: 96,778.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    123,833.32 : 170,890.65 = 70,128.79 : x
  2. Step 2: Convert to fraction form
    123,833.32/170,890.65 = 70,128.79/x
  3. Step 3: Cross multiply
    123,833.32x = 170,890.65 × 70,128.79
  4. Step 4: Simplify right side
    123,833.32x = 11,984,354,506.81
  5. Step 5: Solve for x
    x = 11,984,354,506.81/123,833.32
  6. Step 6: Final answer
    x = 96,778.11

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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.