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Finding the Fourth Proportional to 28,358, 39,134.08 and 15,783.60

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Solution

The fourth proportional to 28,358, 39,134.08 and 15,783.60 is: 21,781.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,358 : 39,134.08 = 15,783.60 : x
  2. Step 2: Convert to fraction form
    28,358/39,134.08 = 15,783.60/x
  3. Step 3: Cross multiply
    28,358x = 39,134.08 × 15,783.60
  4. Step 4: Simplify right side
    28,358x = 617,676,665.09
  5. Step 5: Solve for x
    x = 617,676,665.09/28,358
  6. Step 6: Final answer
    x = 21,781.39

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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.