Home / 42,750.76-64,139.10-20,557.84

Finding the Fourth Proportional to 42,750.76, 64,139.10 and 20,557.84

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Solution

The fourth proportional to 42,750.76, 64,139.10 and 20,557.84 is: 30,842.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    42,750.76 : 64,139.10 = 20,557.84 : x
  2. Step 2: Convert to fraction form
    42,750.76/64,139.10 = 20,557.84/x
  3. Step 3: Cross multiply
    42,750.76x = 64,139.10 × 20,557.84
  4. Step 4: Simplify right side
    42,750.76x = 1,318,561,355.54
  5. Step 5: Solve for x
    x = 1,318,561,355.54/42,750.76
  6. Step 6: Final answer
    x = 30,842.99

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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.