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Finding the Fourth Proportional to 21,164.80, 31,718.40 and 14,124.80

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Solution

The fourth proportional to 21,164.80, 31,718.40 and 14,124.80 is: 21,167.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,164.80 : 31,718.40 = 14,124.80 : x
  2. Step 2: Convert to fraction form
    21,164.80/31,718.40 = 14,124.80/x
  3. Step 3: Cross multiply
    21,164.80x = 31,718.40 × 14,124.80
  4. Step 4: Simplify right side
    21,164.80x = 448,016,056.32
  5. Step 5: Solve for x
    x = 448,016,056.32/21,164.80
  6. Step 6: Final answer
    x = 21,167.98

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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.