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Finding the Fourth Proportional to 86,977.20, 130,174.20 and 76,479.60

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Solution

The fourth proportional to 86,977.20, 130,174.20 and 76,479.60 is: 114,462.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,977.20 : 130,174.20 = 76,479.60 : x
  2. Step 2: Convert to fraction form
    86,977.20/130,174.20 = 76,479.60/x
  3. Step 3: Cross multiply
    86,977.20x = 130,174.20 × 76,479.60
  4. Step 4: Simplify right side
    86,977.20x = 9,955,670,746.32
  5. Step 5: Solve for x
    x = 9,955,670,746.32/86,977.20
  6. Step 6: Final answer
    x = 114,462.99

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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.