Home / 21,089.70-31,598.10-13,690.35

Finding the Fourth Proportional to 21,089.70, 31,598.10 and 13,690.35

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Solution

The fourth proportional to 21,089.70, 31,598.10 and 13,690.35 is: 20,511.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,089.70 : 31,598.10 = 13,690.35 : x
  2. Step 2: Convert to fraction form
    21,089.70/31,598.10 = 13,690.35/x
  3. Step 3: Cross multiply
    21,089.70x = 31,598.10 × 13,690.35
  4. Step 4: Simplify right side
    21,089.70x = 432,589,048.34
  5. Step 5: Solve for x
    x = 432,589,048.34/21,089.70
  6. Step 6: Final answer
    x = 20,511.86

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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.