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Finding the Fourth Proportional to 28,488.90, 42,733.38 and 7,428.92

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Solution

The fourth proportional to 28,488.90, 42,733.38 and 7,428.92 is: 11,143.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,488.90 : 42,733.38 = 7,428.92 : x
  2. Step 2: Convert to fraction form
    28,488.90/42,733.38 = 7,428.92/x
  3. Step 3: Cross multiply
    28,488.90x = 42,733.38 × 7,428.92
  4. Step 4: Simplify right side
    28,488.90x = 317,462,986.76
  5. Step 5: Solve for x
    x = 317,462,986.76/28,488.90
  6. Step 6: Final answer
    x = 11,143.39

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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.