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Finding the Fourth Proportional to 135,428.48, 186,829.26 and 87,697.20

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Solution

The fourth proportional to 135,428.48, 186,829.26 and 87,697.20 is: 120,981.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    135,428.48 : 186,829.26 = 87,697.20 : x
  2. Step 2: Convert to fraction form
    135,428.48/186,829.26 = 87,697.20/x
  3. Step 3: Cross multiply
    135,428.48x = 186,829.26 × 87,697.20
  4. Step 4: Simplify right side
    135,428.48x = 16,384,402,980.07
  5. Step 5: Solve for x
    x = 16,384,402,980.07/135,428.48
  6. Step 6: Final answer
    x = 120,981.96

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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.