Home / 21,717.81-29,971.80-12,157.47

Finding the Fourth Proportional to 21,717.81, 29,971.80 and 12,157.47

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Solution

The fourth proportional to 21,717.81, 29,971.80 and 12,157.47 is: 16,777.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,717.81 : 29,971.80 = 12,157.47 : x
  2. Step 2: Convert to fraction form
    21,717.81/29,971.80 = 12,157.47/x
  3. Step 3: Cross multiply
    21,717.81x = 29,971.80 × 12,157.47
  4. Step 4: Simplify right side
    21,717.81x = 364,381,259.35
  5. Step 5: Solve for x
    x = 364,381,259.35/21,717.81
  6. Step 6: Final answer
    x = 16,777.99

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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.