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Finding the Fourth Proportional to 28,466.39, 42,699.48 and 7,689.89

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Solution

The fourth proportional to 28,466.39, 42,699.48 and 7,689.89 is: 11,534.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,466.39 : 42,699.48 = 7,689.89 : x
  2. Step 2: Convert to fraction form
    28,466.39/42,699.48 = 7,689.89/x
  3. Step 3: Cross multiply
    28,466.39x = 42,699.48 × 7,689.89
  4. Step 4: Simplify right side
    28,466.39x = 328,354,304.26
  5. Step 5: Solve for x
    x = 328,354,304.26/28,466.39
  6. Step 6: Final answer
    x = 11,534.81

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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.