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Finding the Fourth Proportional to 29,310.60, 40,448.78 and 15,881.88

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Solution

The fourth proportional to 29,310.60, 40,448.78 and 15,881.88 is: 21,917.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    29,310.60 : 40,448.78 = 15,881.88 : x
  2. Step 2: Convert to fraction form
    29,310.60/40,448.78 = 15,881.88/x
  3. Step 3: Cross multiply
    29,310.60x = 40,448.78 × 15,881.88
  4. Step 4: Simplify right side
    29,310.60x = 642,402,670.11
  5. Step 5: Solve for x
    x = 642,402,670.11/29,310.60
  6. Step 6: Final answer
    x = 21,917.08

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Why These Related Problems?

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