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Finding the Fourth Proportional to 128,752.40, 193,121.40 and 40,005.20

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Solution

The fourth proportional to 128,752.40, 193,121.40 and 40,005.20 is: 60,005.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,752.40 : 193,121.40 = 40,005.20 : x
  2. Step 2: Convert to fraction form
    128,752.40/193,121.40 = 40,005.20/x
  3. Step 3: Cross multiply
    128,752.40x = 193,121.40 × 40,005.20
  4. Step 4: Simplify right side
    128,752.40x = 7,725,860,231.28
  5. Step 5: Solve for x
    x = 7,725,860,231.28/128,752.40
  6. Step 6: Final answer
    x = 60,005.56

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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.