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Finding the Fourth Proportional to 15,464.64, 21,340.86 and 8,390.90

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Solution

The fourth proportional to 15,464.64, 21,340.86 and 8,390.90 is: 11,579.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,464.64 : 21,340.86 = 8,390.90 : x
  2. Step 2: Convert to fraction form
    15,464.64/21,340.86 = 8,390.90/x
  3. Step 3: Cross multiply
    15,464.64x = 21,340.86 × 8,390.90
  4. Step 4: Simplify right side
    15,464.64x = 179,069,022.17
  5. Step 5: Solve for x
    x = 179,069,022.17/15,464.64
  6. Step 6: Final answer
    x = 11,579.26

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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.