Home / 21,118.88-31,681.74-7,972.40

Finding the Fourth Proportional to 21,118.88, 31,681.74 and 7,972.40

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Solution

The fourth proportional to 21,118.88, 31,681.74 and 7,972.40 is: 11,959.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,118.88 : 31,681.74 = 7,972.40 : x
  2. Step 2: Convert to fraction form
    21,118.88/31,681.74 = 7,972.40/x
  3. Step 3: Cross multiply
    21,118.88x = 31,681.74 × 7,972.40
  4. Step 4: Simplify right side
    21,118.88x = 252,579,503.98
  5. Step 5: Solve for x
    x = 252,579,503.98/21,118.88
  6. Step 6: Final answer
    x = 11,959.89

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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.