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Finding the Fourth Proportional to 620,086.72, 855,979.68 and 419,154.88

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Solution

The fourth proportional to 620,086.72, 855,979.68 and 419,154.88 is: 578,609.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    620,086.72 : 855,979.68 = 419,154.88 : x
  2. Step 2: Convert to fraction form
    620,086.72/855,979.68 = 419,154.88/x
  3. Step 3: Cross multiply
    620,086.72x = 855,979.68 × 419,154.88
  4. Step 4: Simplify right side
    620,086.72x = 358,788,060,052.84
  5. Step 5: Solve for x
    x = 358,788,060,052.84/620,086.72
  6. Step 6: Final answer
    x = 578,609.49

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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.