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Finding the Fourth Proportional to 86,913.80, 130,176.30 and 71,361.80

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Solution

The fourth proportional to 86,913.80, 130,176.30 and 71,361.80 is: 106,883.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,913.80 : 130,176.30 = 71,361.80 : x
  2. Step 2: Convert to fraction form
    86,913.80/130,176.30 = 71,361.80/x
  3. Step 3: Cross multiply
    86,913.80x = 130,176.30 × 71,361.80
  4. Step 4: Simplify right side
    86,913.80x = 9,289,615,085.34
  5. Step 5: Solve for x
    x = 9,289,615,085.34/86,913.80
  6. Step 6: Final answer
    x = 106,883.09

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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.