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Finding the Fourth Proportional to 286,192.80, 428,943.60 and 145,879.20

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Solution

The fourth proportional to 286,192.80, 428,943.60 and 145,879.20 is: 218,642.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    286,192.80 : 428,943.60 = 145,879.20 : x
  2. Step 2: Convert to fraction form
    286,192.80/428,943.60 = 145,879.20/x
  3. Step 3: Cross multiply
    286,192.80x = 428,943.60 × 145,879.20
  4. Step 4: Simplify right side
    286,192.80x = 62,573,949,213.12
  5. Step 5: Solve for x
    x = 62,573,949,213.12/286,192.80
  6. Step 6: Final answer
    x = 218,642.64

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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.