Home / 21,295.68-31,919.29-12,957.31

Finding the Fourth Proportional to 21,295.68, 31,919.29 and 12,957.31

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Solution

The fourth proportional to 21,295.68, 31,919.29 and 12,957.31 is: 19,421.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,295.68 : 31,919.29 = 12,957.31 : x
  2. Step 2: Convert to fraction form
    21,295.68/31,919.29 = 12,957.31/x
  3. Step 3: Cross multiply
    21,295.68x = 31,919.29 × 12,957.31
  4. Step 4: Simplify right side
    21,295.68x = 413,588,135.51
  5. Step 5: Solve for x
    x = 413,588,135.51/21,295.68
  6. Step 6: Final answer
    x = 19,421.22

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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.