Home / 21,818.28-30,110.40-12,871.02

Finding the Fourth Proportional to 21,818.28, 30,110.40 and 12,871.02

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Solution

The fourth proportional to 21,818.28, 30,110.40 and 12,871.02 is: 17,762.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,818.28 : 30,110.40 = 12,871.02 : x
  2. Step 2: Convert to fraction form
    21,818.28/30,110.40 = 12,871.02/x
  3. Step 3: Cross multiply
    21,818.28x = 30,110.40 × 12,871.02
  4. Step 4: Simplify right side
    21,818.28x = 387,551,560.61
  5. Step 5: Solve for x
    x = 387,551,560.61/21,818.28
  6. Step 6: Final answer
    x = 17,762.70

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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.