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Finding the Fourth Proportional to 491,561.79, 678,420.54 and 276,744.12

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Solution

The fourth proportional to 491,561.79, 678,420.54 and 276,744.12 is: 381,943.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    491,561.79 : 678,420.54 = 276,744.12 : x
  2. Step 2: Convert to fraction form
    491,561.79/678,420.54 = 276,744.12/x
  3. Step 3: Cross multiply
    491,561.79x = 678,420.54 × 276,744.12
  4. Step 4: Simplify right side
    491,561.79x = 187,748,895,332.23
  5. Step 5: Solve for x
    x = 187,748,895,332.23/491,561.79
  6. Step 6: Final answer
    x = 381,943.63

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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.