Home / 128,521.40-192,782.10-83,420.60

Finding the Fourth Proportional to 128,521.40, 192,782.10 and 83,420.60

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Solution

The fourth proportional to 128,521.40, 192,782.10 and 83,420.60 is: 125,130.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,521.40 : 192,782.10 = 83,420.60 : x
  2. Step 2: Convert to fraction form
    128,521.40/192,782.10 = 83,420.60/x
  3. Step 3: Cross multiply
    128,521.40x = 192,782.10 × 83,420.60
  4. Step 4: Simplify right side
    128,521.40x = 16,081,998,451.26
  5. Step 5: Solve for x
    x = 16,081,998,451.26/128,521.40
  6. Step 6: Final answer
    x = 125,130.90

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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.