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Finding the Fourth Proportional to 666,990.72, 920,441.75 and 361,060.88

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Solution

The fourth proportional to 666,990.72, 920,441.75 and 361,060.88 is: 498,261.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    666,990.72 : 920,441.75 = 361,060.88 : x
  2. Step 2: Convert to fraction form
    666,990.72/920,441.75 = 361,060.88/x
  3. Step 3: Cross multiply
    666,990.72x = 920,441.75 × 361,060.88
  4. Step 4: Simplify right side
    666,990.72x = 332,335,501,836.23
  5. Step 5: Solve for x
    x = 332,335,501,836.23/666,990.72
  6. Step 6: Final answer
    x = 498,261.06

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.