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Finding the Fourth Proportional to 28,011.80, 42,017.70 and 10,480.70

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Solution

The fourth proportional to 28,011.80, 42,017.70 and 10,480.70 is: 15,721.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,011.80 : 42,017.70 = 10,480.70 : x
  2. Step 2: Convert to fraction form
    28,011.80/42,017.70 = 10,480.70/x
  3. Step 3: Cross multiply
    28,011.80x = 42,017.70 × 10,480.70
  4. Step 4: Simplify right side
    28,011.80x = 440,374,908.39
  5. Step 5: Solve for x
    x = 440,374,908.39/28,011.80
  6. Step 6: Final answer
    x = 15,721.05

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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.