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Finding the Fourth Proportional to 129,978.04, 195,029.05 and 70,812.40

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Solution

The fourth proportional to 129,978.04, 195,029.05 and 70,812.40 is: 106,252.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,978.04 : 195,029.05 = 70,812.40 : x
  2. Step 2: Convert to fraction form
    129,978.04/195,029.05 = 70,812.40/x
  3. Step 3: Cross multiply
    129,978.04x = 195,029.05 × 70,812.40
  4. Step 4: Simplify right side
    129,978.04x = 13,810,475,100.22
  5. Step 5: Solve for x
    x = 13,810,475,100.22/129,978.04
  6. Step 6: Final answer
    x = 106,252.37

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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.