Home / 85,819.31-128,561.36-40,776.56

Finding the Fourth Proportional to 85,819.31, 128,561.36 and 40,776.56

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Solution

The fourth proportional to 85,819.31, 128,561.36 and 40,776.56 is: 61,085.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,819.31 : 128,561.36 = 40,776.56 : x
  2. Step 2: Convert to fraction form
    85,819.31/128,561.36 = 40,776.56/x
  3. Step 3: Cross multiply
    85,819.31x = 128,561.36 × 40,776.56
  4. Step 4: Simplify right side
    85,819.31x = 5,242,289,366.91
  5. Step 5: Solve for x
    x = 5,242,289,366.91/85,819.31
  6. Step 6: Final answer
    x = 61,085.20

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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.