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Finding the Fourth Proportional to 21,784.80, 32,677.20 and 8,630.40

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Solution

The fourth proportional to 21,784.80, 32,677.20 and 8,630.40 is: 12,945.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,784.80 : 32,677.20 = 8,630.40 : x
  2. Step 2: Convert to fraction form
    21,784.80/32,677.20 = 8,630.40/x
  3. Step 3: Cross multiply
    21,784.80x = 32,677.20 × 8,630.40
  4. Step 4: Simplify right side
    21,784.80x = 282,017,306.88
  5. Step 5: Solve for x
    x = 282,017,306.88/21,784.80
  6. Step 6: Final answer
    x = 12,945.60

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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.