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Finding the Fourth Proportional to 28,478.94, 42,711.84 and 8,484.36

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Solution

The fourth proportional to 28,478.94, 42,711.84 and 8,484.36 is: 12,724.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,478.94 : 42,711.84 = 8,484.36 : x
  2. Step 2: Convert to fraction form
    28,478.94/42,711.84 = 8,484.36/x
  3. Step 3: Cross multiply
    28,478.94x = 42,711.84 × 8,484.36
  4. Step 4: Simplify right side
    28,478.94x = 362,382,626.82
  5. Step 5: Solve for x
    x = 362,382,626.82/28,478.94
  6. Step 6: Final answer
    x = 12,724.58

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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.