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Finding the Fourth Proportional to 28,490.65, 42,736.01 and 7,430.68

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Solution

The fourth proportional to 28,490.65, 42,736.01 and 7,430.68 is: 11,146.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,490.65 : 42,736.01 = 7,430.68 : x
  2. Step 2: Convert to fraction form
    28,490.65/42,736.01 = 7,430.68/x
  3. Step 3: Cross multiply
    28,490.65x = 42,736.01 × 7,430.68
  4. Step 4: Simplify right side
    28,490.65x = 317,557,614.79
  5. Step 5: Solve for x
    x = 317,557,614.79/28,490.65
  6. Step 6: Final answer
    x = 11,146.03

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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.