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Finding the Fourth Proportional to 28,520.84, 42,764.84 and 10,988.40

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Solution

The fourth proportional to 28,520.84, 42,764.84 and 10,988.40 is: 16,476.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,520.84 : 42,764.84 = 10,988.40 : x
  2. Step 2: Convert to fraction form
    28,520.84/42,764.84 = 10,988.40/x
  3. Step 3: Cross multiply
    28,520.84x = 42,764.84 × 10,988.40
  4. Step 4: Simplify right side
    28,520.84x = 469,917,167.86
  5. Step 5: Solve for x
    x = 469,917,167.86/28,520.84
  6. Step 6: Final answer
    x = 16,476.27

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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.