Home / 78,739.90-108,661.55-42,930.51

Finding the Fourth Proportional to 78,739.90, 108,661.55 and 42,930.51

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Solution

The fourth proportional to 78,739.90, 108,661.55 and 42,930.51 is: 59,244.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,739.90 : 108,661.55 = 42,930.51 : x
  2. Step 2: Convert to fraction form
    78,739.90/108,661.55 = 42,930.51/x
  3. Step 3: Cross multiply
    78,739.90x = 108,661.55 × 42,930.51
  4. Step 4: Simplify right side
    78,739.90x = 4,664,895,378.24
  5. Step 5: Solve for x
    x = 4,664,895,378.24/78,739.90
  6. Step 6: Final answer
    x = 59,244.37

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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.