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Finding the Fourth Proportional to 128,412.80, 192,619.20 and 39,658.40

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Solution

The fourth proportional to 128,412.80, 192,619.20 and 39,658.40 is: 59,487.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,412.80 : 192,619.20 = 39,658.40 : x
  2. Step 2: Convert to fraction form
    128,412.80/192,619.20 = 39,658.40/x
  3. Step 3: Cross multiply
    128,412.80x = 192,619.20 × 39,658.40
  4. Step 4: Simplify right side
    128,412.80x = 7,638,969,281.28
  5. Step 5: Solve for x
    x = 7,638,969,281.28/128,412.80
  6. Step 6: Final answer
    x = 59,487.60

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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.