Home / 21,006.80-31,510.20-18,933.20

Finding the Fourth Proportional to 21,006.80, 31,510.20 and 18,933.20

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Solution

The fourth proportional to 21,006.80, 31,510.20 and 18,933.20 is: 28,399.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,006.80 : 31,510.20 = 18,933.20 : x
  2. Step 2: Convert to fraction form
    21,006.80/31,510.20 = 18,933.20/x
  3. Step 3: Cross multiply
    21,006.80x = 31,510.20 × 18,933.20
  4. Step 4: Simplify right side
    21,006.80x = 596,588,918.64
  5. Step 5: Solve for x
    x = 596,588,918.64/21,006.80
  6. Step 6: Final answer
    x = 28,399.80

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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.