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Finding the Fourth Proportional to 135,358, 186,878.76 and 86,979.52

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Solution

The fourth proportional to 135,358, 186,878.76 and 86,979.52 is: 120,086.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    135,358 : 186,878.76 = 86,979.52 : x
  2. Step 2: Convert to fraction form
    135,358/186,878.76 = 86,979.52/x
  3. Step 3: Cross multiply
    135,358x = 186,878.76 × 86,979.52
  4. Step 4: Simplify right side
    135,358x = 16,254,624,843.00
  5. Step 5: Solve for x
    x = 16,254,624,843.00/135,358
  6. Step 6: Final answer
    x = 120,086.18

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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.