Home / 103,819.10-155,631.45-81,317.30

Finding the Fourth Proportional to 103,819.10, 155,631.45 and 81,317.30

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Solution

The fourth proportional to 103,819.10, 155,631.45 and 81,317.30 is: 121,899.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    103,819.10 : 155,631.45 = 81,317.30 : x
  2. Step 2: Convert to fraction form
    103,819.10/155,631.45 = 81,317.30/x
  3. Step 3: Cross multiply
    103,819.10x = 155,631.45 × 81,317.30
  4. Step 4: Simplify right side
    103,819.10x = 12,655,529,309.09
  5. Step 5: Solve for x
    x = 12,655,529,309.09/103,819.10
  6. Step 6: Final answer
    x = 121,899.82

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.