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Finding the Fourth Proportional to 19,205.40, 28,808.10 and 12,644.40

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Solution

The fourth proportional to 19,205.40, 28,808.10 and 12,644.40 is: 18,966.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,205.40 : 28,808.10 = 12,644.40 : x
  2. Step 2: Convert to fraction form
    19,205.40/28,808.10 = 12,644.40/x
  3. Step 3: Cross multiply
    19,205.40x = 28,808.10 × 12,644.40
  4. Step 4: Simplify right side
    19,205.40x = 364,261,139.64
  5. Step 5: Solve for x
    x = 364,261,139.64/19,205.40
  6. Step 6: Final answer
    x = 18,966.60

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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.