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Finding the Fourth Proportional to 9,907.76, 13,672.72 and 5,431.68

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Solution

The fourth proportional to 9,907.76, 13,672.72 and 5,431.68 is: 7,495.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,907.76 : 13,672.72 = 5,431.68 : x
  2. Step 2: Convert to fraction form
    9,907.76/13,672.72 = 5,431.68/x
  3. Step 3: Cross multiply
    9,907.76x = 13,672.72 × 5,431.68
  4. Step 4: Simplify right side
    9,907.76x = 74,265,839.77
  5. Step 5: Solve for x
    x = 74,265,839.77/9,907.76
  6. Step 6: Final answer
    x = 7,495.72

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These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.