Home / 78,390.60-108,176.76-42,579.36

Finding the Fourth Proportional to 78,390.60, 108,176.76 and 42,579.36

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Solution

The fourth proportional to 78,390.60, 108,176.76 and 42,579.36 is: 58,758.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,390.60 : 108,176.76 = 42,579.36 : x
  2. Step 2: Convert to fraction form
    78,390.60/108,176.76 = 42,579.36/x
  3. Step 3: Cross multiply
    78,390.60x = 108,176.76 × 42,579.36
  4. Step 4: Simplify right side
    78,390.60x = 4,606,097,207.67
  5. Step 5: Solve for x
    x = 4,606,097,207.67/78,390.60
  6. Step 6: Final answer
    x = 58,758.28

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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.