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Finding the Fourth Proportional to 663,962.73, 916,339.53 and 405,990.87

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Solution

The fourth proportional to 663,962.73, 916,339.53 and 405,990.87 is: 560,310.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    663,962.73 : 916,339.53 = 405,990.87 : x
  2. Step 2: Convert to fraction form
    663,962.73/916,339.53 = 405,990.87/x
  3. Step 3: Cross multiply
    663,962.73x = 916,339.53 × 405,990.87
  4. Step 4: Simplify right side
    663,962.73x = 372,025,483,000.09
  5. Step 5: Solve for x
    x = 372,025,483,000.09/663,962.73
  6. Step 6: Final answer
    x = 560,310.79

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1.5x scale

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.