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Finding the Fourth Proportional to 15,358, 21,186.60 and 13,365.40

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Solution

The fourth proportional to 15,358, 21,186.60 and 13,365.40 is: 18,437.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,358 : 21,186.60 = 13,365.40 : x
  2. Step 2: Convert to fraction form
    15,358/21,186.60 = 13,365.40/x
  3. Step 3: Cross multiply
    15,358x = 21,186.60 × 13,365.40
  4. Step 4: Simplify right side
    15,358x = 283,167,383.64
  5. Step 5: Solve for x
    x = 283,167,383.64/15,358
  6. Step 6: Final answer
    x = 18,437.78

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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.