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Finding the Fourth Proportional to 86,911.20, 130,269.60 and 49,489.20

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Solution

The fourth proportional to 86,911.20, 130,269.60 and 49,489.20 is: 74,178.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,911.20 : 130,269.60 = 49,489.20 : x
  2. Step 2: Convert to fraction form
    86,911.20/130,269.60 = 49,489.20/x
  3. Step 3: Cross multiply
    86,911.20x = 130,269.60 × 49,489.20
  4. Step 4: Simplify right side
    86,911.20x = 6,446,938,288.32
  5. Step 5: Solve for x
    x = 6,446,938,288.32/86,911.20
  6. Step 6: Final answer
    x = 74,178.45

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.