Home / 21,987.79-30,343.19-12,911.40

Finding the Fourth Proportional to 21,987.79, 30,343.19 and 12,911.40

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Solution

The fourth proportional to 21,987.79, 30,343.19 and 12,911.40 is: 17,817.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,987.79 : 30,343.19 = 12,911.40 : x
  2. Step 2: Convert to fraction form
    21,987.79/30,343.19 = 12,911.40/x
  3. Step 3: Cross multiply
    21,987.79x = 30,343.19 × 12,911.40
  4. Step 4: Simplify right side
    21,987.79x = 391,773,071.44
  5. Step 5: Solve for x
    x = 391,773,071.44/21,987.79
  6. Step 6: Final answer
    x = 17,817.76

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.