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Finding the Fourth Proportional to 76,669.80, 115,004.70 and 58,007.40

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Solution

The fourth proportional to 76,669.80, 115,004.70 and 58,007.40 is: 87,011.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    76,669.80 : 115,004.70 = 58,007.40 : x
  2. Step 2: Convert to fraction form
    76,669.80/115,004.70 = 58,007.40/x
  3. Step 3: Cross multiply
    76,669.80x = 115,004.70 × 58,007.40
  4. Step 4: Simplify right side
    76,669.80x = 6,671,123,634.78
  5. Step 5: Solve for x
    x = 6,671,123,634.78/76,669.80
  6. Step 6: Final answer
    x = 87,011.10

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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.