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Finding the Fourth Proportional to 28,390.36, 42,580.68 and 7,609

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Solution

The fourth proportional to 28,390.36, 42,580.68 and 7,609 is: 11,412.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,390.36 : 42,580.68 = 7,609 : x
  2. Step 2: Convert to fraction form
    28,390.36/42,580.68 = 7,609/x
  3. Step 3: Cross multiply
    28,390.36x = 42,580.68 × 7,609
  4. Step 4: Simplify right side
    28,390.36x = 323,996,394.12
  5. Step 5: Solve for x
    x = 323,996,394.12/28,390.36
  6. Step 6: Final answer
    x = 11,412.20

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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.