Home / 78,779.20-108,716.60-42,969.22

Finding the Fourth Proportional to 78,779.20, 108,716.60 and 42,969.22

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Solution

The fourth proportional to 78,779.20, 108,716.60 and 42,969.22 is: 59,298.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,779.20 : 108,716.60 = 42,969.22 : x
  2. Step 2: Convert to fraction form
    78,779.20/108,716.60 = 42,969.22/x
  3. Step 3: Cross multiply
    78,779.20x = 108,716.60 × 42,969.22
  4. Step 4: Simplify right side
    78,779.20x = 4,671,467,503.05
  5. Step 5: Solve for x
    x = 4,671,467,503.05/78,779.20
  6. Step 6: Final answer
    x = 59,298.23

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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.