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Finding the Fourth Proportional to 57,920.76, 86,888.30 and 20,473.11

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Solution

The fourth proportional to 57,920.76, 86,888.30 and 20,473.11 is: 30,712.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    57,920.76 : 86,888.30 = 20,473.11 : x
  2. Step 2: Convert to fraction form
    57,920.76/86,888.30 = 20,473.11/x
  3. Step 3: Cross multiply
    57,920.76x = 86,888.30 × 20,473.11
  4. Step 4: Simplify right side
    57,920.76x = 1,778,873,621.25
  5. Step 5: Solve for x
    x = 1,778,873,621.25/57,920.76
  6. Step 6: Final answer
    x = 30,712.19

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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.