Home / 78,721.60-108,633.12-42,911.04

Finding the Fourth Proportional to 78,721.60, 108,633.12 and 42,911.04

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Solution

The fourth proportional to 78,721.60, 108,633.12 and 42,911.04 is: 59,215.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,721.60 : 108,633.12 = 42,911.04 : x
  2. Step 2: Convert to fraction form
    78,721.60/108,633.12 = 42,911.04/x
  3. Step 3: Cross multiply
    78,721.60x = 108,633.12 × 42,911.04
  4. Step 4: Simplify right side
    78,721.60x = 4,661,560,157.64
  5. Step 5: Solve for x
    x = 4,661,560,157.64/78,721.60
  6. Step 6: Final answer
    x = 59,215.77

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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.