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Finding the Fourth Proportional to 666,986.42, 920,437.88 and 361,063.40

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Solution

The fourth proportional to 666,986.42, 920,437.88 and 361,063.40 is: 498,265.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    666,986.42 : 920,437.88 = 361,063.40 : x
  2. Step 2: Convert to fraction form
    666,986.42/920,437.88 = 361,063.40/x
  3. Step 3: Cross multiply
    666,986.42x = 920,437.88 × 361,063.40
  4. Step 4: Simplify right side
    666,986.42x = 332,336,424,034.09
  5. Step 5: Solve for x
    x = 332,336,424,034.09/666,986.42
  6. Step 6: Final answer
    x = 498,265.66

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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.