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Finding the Fourth Proportional to 28,212.51, 42,318.91 and 8,490.93

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Solution

The fourth proportional to 28,212.51, 42,318.91 and 8,490.93 is: 12,736.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,212.51 : 42,318.91 = 8,490.93 : x
  2. Step 2: Convert to fraction form
    28,212.51/42,318.91 = 8,490.93/x
  3. Step 3: Cross multiply
    28,212.51x = 42,318.91 × 8,490.93
  4. Step 4: Simplify right side
    28,212.51x = 359,326,902.49
  5. Step 5: Solve for x
    x = 359,326,902.49/28,212.51
  6. Step 6: Final answer
    x = 12,736.44

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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.