Home / 21,011.40-31,517.10-18,897.30

Finding the Fourth Proportional to 21,011.40, 31,517.10 and 18,897.30

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Solution

The fourth proportional to 21,011.40, 31,517.10 and 18,897.30 is: 28,345.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,011.40 : 31,517.10 = 18,897.30 : x
  2. Step 2: Convert to fraction form
    21,011.40/31,517.10 = 18,897.30/x
  3. Step 3: Cross multiply
    21,011.40x = 31,517.10 × 18,897.30
  4. Step 4: Simplify right side
    21,011.40x = 595,588,093.83
  5. Step 5: Solve for x
    x = 595,588,093.83/21,011.40
  6. Step 6: Final answer
    x = 28,345.95

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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.