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Finding the Fourth Proportional to 21,016.80, 31,510.80 and 9,928.80

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Solution

The fourth proportional to 21,016.80, 31,510.80 and 9,928.80 is: 14,886.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,016.80 : 31,510.80 = 9,928.80 : x
  2. Step 2: Convert to fraction form
    21,016.80/31,510.80 = 9,928.80/x
  3. Step 3: Cross multiply
    21,016.80x = 31,510.80 × 9,928.80
  4. Step 4: Simplify right side
    21,016.80x = 312,864,431.04
  5. Step 5: Solve for x
    x = 312,864,431.04/21,016.80
  6. Step 6: Final answer
    x = 14,886.40

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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.