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Finding the Fourth Proportional to 128,457.70, 192,907.07 and 78,829.20

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Solution

The fourth proportional to 128,457.70, 192,907.07 and 78,829.20 is: 118,379.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,457.70 : 192,907.07 = 78,829.20 : x
  2. Step 2: Convert to fraction form
    128,457.70/192,907.07 = 78,829.20/x
  3. Step 3: Cross multiply
    128,457.70x = 192,907.07 × 78,829.20
  4. Step 4: Simplify right side
    128,457.70x = 15,206,709,903.91
  5. Step 5: Solve for x
    x = 15,206,709,903.91/128,457.70
  6. Step 6: Final answer
    x = 118,379.13

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1.5x scale

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.