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Finding the Fourth Proportional to 15,159.87, 20,920.63 and 8,445.51

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Solution

The fourth proportional to 15,159.87, 20,920.63 and 8,445.51 is: 11,654.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,159.87 : 20,920.63 = 8,445.51 : x
  2. Step 2: Convert to fraction form
    15,159.87/20,920.63 = 8,445.51/x
  3. Step 3: Cross multiply
    15,159.87x = 20,920.63 × 8,445.51
  4. Step 4: Simplify right side
    15,159.87x = 176,685,494.72
  5. Step 5: Solve for x
    x = 176,685,494.72/15,159.87
  6. Step 6: Final answer
    x = 11,654.82

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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.