Home / 21,289.91-31,920.15-9,437.21

Finding the Fourth Proportional to 21,289.91, 31,920.15 and 9,437.21

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Solution

The fourth proportional to 21,289.91, 31,920.15 and 9,437.21 is: 14,149.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,289.91 : 31,920.15 = 9,437.21 : x
  2. Step 2: Convert to fraction form
    21,289.91/31,920.15 = 9,437.21/x
  3. Step 3: Cross multiply
    21,289.91x = 31,920.15 × 9,437.21
  4. Step 4: Simplify right side
    21,289.91x = 301,237,127.73
  5. Step 5: Solve for x
    x = 301,237,127.73/21,289.91
  6. Step 6: Final answer
    x = 14,149.29

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1.5x scale

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.