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Finding the Fourth Proportional to 656,623.65, 905,986.31 and 398,494.88

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Solution

The fourth proportional to 656,623.65, 905,986.31 and 398,494.88 is: 549,829.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    656,623.65 : 905,986.31 = 398,494.88 : x
  2. Step 2: Convert to fraction form
    656,623.65/905,986.31 = 398,494.88/x
  3. Step 3: Cross multiply
    656,623.65x = 905,986.31 × 398,494.88
  4. Step 4: Simplify right side
    656,623.65x = 361,030,899,362.69
  5. Step 5: Solve for x
    x = 361,030,899,362.69/656,623.65
  6. Step 6: Final answer
    x = 549,829.27

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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.