Home / 21,126.98-31,690.49-9,117.87

Finding the Fourth Proportional to 21,126.98, 31,690.49 and 9,117.87

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Solution

The fourth proportional to 21,126.98, 31,690.49 and 9,117.87 is: 13,676.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,126.98 : 31,690.49 = 9,117.87 : x
  2. Step 2: Convert to fraction form
    21,126.98/31,690.49 = 9,117.87/x
  3. Step 3: Cross multiply
    21,126.98x = 31,690.49 × 9,117.87
  4. Step 4: Simplify right side
    21,126.98x = 288,949,654.92
  5. Step 5: Solve for x
    x = 288,949,654.92/21,126.98
  6. Step 6: Final answer
    x = 13,676.81

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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.