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Finding the Fourth Proportional to 28,206, 42,309 and 7,429.50

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Solution

The fourth proportional to 28,206, 42,309 and 7,429.50 is: 11,144.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,206 : 42,309 = 7,429.50 : x
  2. Step 2: Convert to fraction form
    28,206/42,309 = 7,429.50/x
  3. Step 3: Cross multiply
    28,206x = 42,309 × 7,429.50
  4. Step 4: Simplify right side
    28,206x = 314,334,715.50
  5. Step 5: Solve for x
    x = 314,334,715.50/28,206
  6. Step 6: Final answer
    x = 11,144.25

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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.