Home / 21,095.80-31,646.40-7,769.68

Finding the Fourth Proportional to 21,095.80, 31,646.40 and 7,769.68

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Solution

The fourth proportional to 21,095.80, 31,646.40 and 7,769.68 is: 11,655.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,095.80 : 31,646.40 = 7,769.68 : x
  2. Step 2: Convert to fraction form
    21,095.80/31,646.40 = 7,769.68/x
  3. Step 3: Cross multiply
    21,095.80x = 31,646.40 × 7,769.68
  4. Step 4: Simplify right side
    21,095.80x = 245,882,401.15
  5. Step 5: Solve for x
    x = 245,882,401.15/21,095.80
  6. Step 6: Final answer
    x = 11,655.51

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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.