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Finding the Fourth Proportional to 128,504.91, 192,803.48 and 57,421.61

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Solution

The fourth proportional to 128,504.91, 192,803.48 and 57,421.61 is: 86,153.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,504.91 : 192,803.48 = 57,421.61 : x
  2. Step 2: Convert to fraction form
    128,504.91/192,803.48 = 57,421.61/x
  3. Step 3: Cross multiply
    128,504.91x = 192,803.48 × 57,421.61
  4. Step 4: Simplify right side
    128,504.91x = 11,071,084,984.08
  5. Step 5: Solve for x
    x = 11,071,084,984.08/128,504.91
  6. Step 6: Final answer
    x = 86,153.01

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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.