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Finding the Fourth Proportional to 76,591.36, 114,921.60 and 39,128.32

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Solution

The fourth proportional to 76,591.36, 114,921.60 and 39,128.32 is: 58,710.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    76,591.36 : 114,921.60 = 39,128.32 : x
  2. Step 2: Convert to fraction form
    76,591.36/114,921.60 = 39,128.32/x
  3. Step 3: Cross multiply
    76,591.36x = 114,921.60 × 39,128.32
  4. Step 4: Simplify right side
    76,591.36x = 4,496,689,139.71
  5. Step 5: Solve for x
    x = 4,496,689,139.71/76,591.36
  6. Step 6: Final answer
    x = 58,710.14

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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.